Originally Posted by Futuwwa
As muslim, we must believe that prophet Muhammad SAW is the descendant of Ibrahim (as) through Ismail (as) because Allah SWT says so.
Shahih Bukhari Volume 1, Book 8, Number 345:
Narrated Abu Dhar:
Allah's Apostle said, "While I was at Mecca the roof of my house was opened and Gabriel descended, opened my chest, and washed it with Zam-zam water. Then he brought a golden tray full of wisdom and faith and having poured its contents into my chest, he closed it. Then he took my hand and ascended with me to the nearest heaven, when I reached the nearest heaven, Gabriel said to the gatekeeper of the heaven, 'Open (the gate).' The gatekeeper asked, 'Who is it?' Gabriel answered: 'Gabriel.' He asked, 'Is there anyone with you?' Gabriel replied, 'Yes, Muhammad I is with me.' He asked, 'Has he been called?' Gabriel said, 'Yes.' So the gate was opened and we went over the nearest heaven and there we saw a man sitting with some people on his right and some on his left. When he looked towards his right, he laughed and when he looked toward his left he wept. Then he said, 'Welcome! O pious Prophet and pious son.' I asked Gabriel, 'Who is he?' He replied, 'He is Adam and the people on his right and left are the souls of his offspring. Those on his right are the people of Paradise and those on his left are the people of Hell and when he looks towards his right he laughs and when he looks towards his left he weeps.'
Then he ascended with me till he reached the second heaven and he (Gabriel) said to its gatekeeper, 'Open (the gate).' The gatekeeper said to him the same as the gatekeeper of the first heaven had said and he opened the gate. Anas said: "Abu Dhar added that the Prophet met Adam, Idris, Moses, Jesus and Abraham, he (Abu Dhar) did not mention on which heaven they were but he mentioned that he (the Prophet ) met Adarn on the nearest heaven and Abraham on the sixth heaven. Anas said, "When Gabriel along with the Prophet passed by Idris, the latter said, 'Welcome! O pious Prophet and pious brother.' The Prophet asked, 'Who is he?' Gabriel replied, 'He is Idris." The Prophet added, "I passed by Moses and he said, 'Welcome! O pious Prophet and pious brother.' I asked Gabriel, 'Who is he?' Gabriel replied, 'He is Moses.' Then I passed by Jesus and he said, 'Welcome! O pious brother and pious Prophet.' I asked, 'Who is he?' Gabriel replied, 'He is Jesus.
Then I passed by Abraham and he said, 'Welcome! O pious Prophet and pious son
.' I asked Gabriel, 'Who is he?' Gabriel replied, 'He is Abraham.
Notice the prophet Muhammad meets several prophets and they all welcome him by saying welcome o pious prophet and brother. Yet when the prophet Muhammad meets Abraham he is called pious prophet AND SON, rather than brother. The reason to this is because the prophet Muhammad descends from Abraham hence the prophet is called a son rather than a brother.
Originally Posted by Futuwwa
We all are the sons of Adam.
From the Qur'an, we know that prophet Muhammad SAW is indeed the descendant of prophet Ibrahim (as) as Allah SWT says:
Indeed, Allah chose Adam and Noah and the family of Abraham and the family of 'Imran over the worlds -
Descendants, some of them from others. And Allah is Hearing and Knowing. (QS. 3:33-34)
Without doubt, among men, the nearest of kin to Abraham, are those who follow him, as are also this Messenger and those who believe: And Allah is the Protector of those who have faith. (QS. 3:68)