Jesus told his followers:

17 “Don’t think that I came to destroy the law or the prophets. I didn’t come to destroy, but to fulfill. 18 For most certainly, I tell you, until heaven and earth pass away, not even one smallest letter or one tiny pen stroke shall in any way pass away from the law, until all things are accomplished. 19 Whoever, therefore, shall break one of these least commandments, and teach others to do so, shall be called least in the Kingdom of Heaven; but whoever shall do and teach them shall be called great in the Kingdom of Heaven."

Matthew 5:17-19 - World English Bible

These three verses act as a transition from the ideal of the disciple (Beatitudes and the parables of salt and light) to an interpretation of the Law. In other words, Jesus stated the qualities of the follower, then shifted to the ways the disciple would act.

Unlike other religions in the first century AD, Judaism was literary; its tenets and practices were based upon its Scripture. So the "law and the prophets" (i.e., the Hebrew Bible) were held in such a high esteem that scribes took great care in copying them, even in the greatest detail (the smallest letter known as the "iota" and the tiny pen stroke known as the "serif," both from the Greek). Jesus qualified his remarks as a true interpretation of the Torah, not a false one that would damage its "fabric." Hence, he stressed care in teaching the Law; the one who had a loose interpretation and taught others the same would have a poor reputation, but the one who had an interpretation faithful to that of the Christ would have a great reputation.

How have you keep the commands of Jesus?