(Psalm 19:7)The law of the LORD is perfect, restoring the soul; The testimony of the LORD is sure, making wise the simple.
Gods law is perfect,
Timothy 3:16 (New International Version)
All Scripture is God-breathed and is useful for teaching, rebuking, correcting and training in righteousness,
all scripture is God breathed and usefull for teaching that INCLUDES both the N>T and O>T
Jesus orders Christians to follow the Old Testament's laws:* "Do not think that I [Jesus] have come to abolish the Law (the Old Testament) or the Prophets; I have not come to abolish them but to fulfill them.* I tell you the truth, until heaven and earth disappear, not the smallest letter, not the least stroke or a pen, will by any means disappear from the Law (the Old Testament) until everything is accomplished.* (Matthew 5:17-18)"
It is quite clear from these verses from the New Testament that Jesus peace be upon him did honor the Old Testament and did say that every single "letter" of it has to be honored, followed and fulfilled. fullfill doesnt mean to destroy it means to add to the law meaning make new ones in addition to the old ones