So: How do we know that the Tradition, that is, the Laws and other Teachings of the Torah, have been transmitted correctly?
Let us examine the method of Transmission of the Torah that Jews have used, as well as other relevant factors. We will see that the way the Torah has been transmitted through the ages makes errors and falsifications impossible.
The first thing to note is that the Torah is not the property of a few people. It is not esoteric or secret knowledge kept in the hands of a secret organization. Every Jew is expected to study Torah. We each have our individual abilities and gifts, and we are all therefore expected to study Torah at the highest level we can attain. (And before I get letters about this, it applies to women too. Women are required to study -- at the very least -- all the Laws that they must fulfill, and today much, much more study and knowledge is expected of them than in years past.)
Some people think the Talmud was written by a few Rabbis plotting together in an attic somewhere, deciding what Jews should do and not do. This is a radical error. It is completely false, and not even close to fact by any means. It was not composed, but recorded, by thousands upon thousands of Rabbis and students working in public, openly discussing all the issues. This ensured the highest safety against errors.
We are a nation of Torah. We have always been, and we always will be. There were times of great oppression, when Torah study was made difficult by the gentile governments around us, but through it all we stuck to it. And not individually -- but en masse. Torah has always been taught publicly. Not, as some seem to think, one little old Rabbi in a basement or dungeon teaching one decrepit geek of a student, neither of whom has any idea of how the common man lives.
The truth is that Rabbis taught the Torah in public, with other Rabbis at their sides, and with thousands of students learning and asking challenging questions. These were Rabbis who usually had jobs in what some people call "the real world," and they came from all sectors of Jewish society. Some were poor, some were rich, but all of them lived the Torah they taught, and lived in the world around them like everyone else.
The Talmud tells us that Rabbi Akiva had twenty-four thousand students. He was not unusual. The Talmud doesn't say he had an inordinately large number of students. No, quite the contrary. In the Torah Academies of Israel and Babylon there were learned Rabbis sitting together in a semi-circle, with all their thousands of students sitting behind them. And the Talmud teaches that every Rabbi should create many, many students (Avos 1:1).
The Talmud says that for a while Rabbi Gamliel of Yavneh would allow entry to the highest Academy in Yavneh only to some students. But then one day that was changed, and they allowed all students to enter. That day, says the Talmud, they had to add seven thousand more benches to the academy! We're not talking about private study here. We're talking about study that involved all the people. An entire nation.
The Talmud says (Sanhedrin 91b) that whoever refuses to teach Torah to another Jew is stealing his inheritance from him. The Torah says, "The Torah that Moses taught us is an inheritance of the Congregation of Jacob" (Deut. 33:4). Therefore, the Torah belongs to all Jews, by ancestral right. Thus, if you refuse to teach a Jew Torah, you are stealing his inheritance, his birthright.
Moreover, say the Talmudic Rabbis, why does the verse use the term "Congregation of Jacob? Why not say, "the Children of Jacob," or "the descendants of Jacob?" It is to teach us, explain the Rabbis, that the Torah should not be kept private, but should be taught in public, with the congregation participating (Midrash Tehillim 1:1).
The Tradition did not begin with the Mishnah and Talmud, of course. Remember, Moses taught the Torah to all of the Children of Israel. As I have written elsewhere, Moses was taught directly by Hashem, every single word of Torah, both the Written Torah and the Oral Torah. Hashem made special arrangements so Moses could ask any question he needed to ask. Hashem taught Moses the Torah passage by passage.
Moses then taught Aharon the High Priest everything he had learned. Then, while Aharon was still sitting there, he called in Aharon's two sons Elazar and Isamar, and he taught them. Then they called in the Seventy Elders and he taught them. Then they called in all the Children of Israel, and Moses taught them. The Children of Israel would write each teaching down.
Then Aharon taught everyone the same passage. Then the two sons of Aharon taught everyone the passage. Then the Elders would teach it. This way, each person learned it at least four times, at several levels. (We can imagine that each probably had their own teaching style as well, which maximized general understanding.) Then people would gather with the leaders and learn with them, reviewing, asking questions, discussing each issue. Every group of ten Jews had a Teacher. Ten groups had a Teacher of that hundred, and ten hundreds had a Teacher of that thousand, and so on. (The Teachers were chosen from the most honorable and learned people to be found.) So again, all this was done in public.
After Moses passed away the Children of Israel continued to study Torah. In the Land of Israel they built yeshivos, and Teachers taught Torah to thousands upon thousands of students constantly. Some yeshivos were smaller, of course. We find, for example, that the Prophet Elisha had at least one hundred students (2 Kings 4:38-44). Students generally searched until they found the best Teacher for them, since people aren't all able to learn at the same level.
We also had, when we all lived in Israel, the Torah's complex system of appellate courts, to guarantee self-correction and various other checks and balances. Each city had a Jewish Court of 23 highly-qualified Judges, who were also required to teach Torah publicly. Jerusalem alone had at least three courts, the Supreme Court (later called the Sanhedrin) consisting of 71 Judges with their students. All this was to ensure that the Torah was preserved accurately, and to ensure that all of Israel knew the Torah.
Other countries have gross national products. The national product of the Jews is the Torah. The Nation of Israel never had gladiators, nor circuses, nor sports arenas, nor theaters, nor pageants, nor any of the recreational diversions that were found so often among other nations. The study of Torah has been our national recreation, our pastime, our holy service to Hashem.
And it was not a casual pastime. Most Rabbis devoted their entire lives to studying Torah. They studied it day and night, and slept and ate little. Many Rabbis had to work for a living, but their lives were wholly devoted to Torah study. They recited Torah as they worked. (This is true even today. I actually knew a man who did this constantly. He worked in a warehouse, walking around filling orders. He would recite Mishnayos by heart all day. When I wanted to speak to him I often had to wait until he finished the Mishnah he was reviewing.) And after work they hurried to study Torah in whatever time they had for as long as they could stay awake. As King David says in Psalms, "I love your Torah so much that that's what I talk about all day" (119:97).
Hillel the Elder (112 B.C.E. - 8 C.E.) began as a very poor man. He earned very little money a day. Each day he would give half his money to the doorkeeper of the yeshivah so he could attend the classes of Shmaya and Avtalyon, the leading Elders of the generation. Once, on a Friday, when he did not have the few pennies it cost, Hillel climbed up the wall of the Academy and listened through the skylight. It began to snow, and he stayed on. Eventually, he got stuck there, and his body was noticed Shabbos morning, stuck on the skylight on the roof under the snow. The Leaders of the generation themselves, Shmaya and Avtalyon, ran and brought a ladder and climbed up and took him down. To save his life, they started a fire (even though it was the Sabbath, since we are obligated to break the Sabbath to save a life).
This sort of man will make sure to learn Torah without errors, and he certainly does not falsify his teachings. He loved the Torah too much for that.
The study of Torah was so important, that Jews would stop at nothing to learn it. And because it was so important to them, they took great care to preserve the teachings of the Torah perfectly.
It was Avtalyon, one of those two Rabbis in that story, who used to warn his students and colleagues, "Rabbis! Be very careful with your words, so that your students do not make any mistakes" (Avos 1:11). How very important it was to the Rabbis that the Torah be taught carefully and correctly, so that mistakes do not occur.
The study of Torah was so dear to the Jews that many safeguards were put in place to ensure that it was done properly. The Talmud talks about Rabbis teaching the same material hundreds of times to the same student to make sure it was understood properly. The Rabbis instructed all Torah students to review every lesson at least one hundred and one times (Babylonian Talmud, Chagigah 9b).