Pseudo-Chrysostom
Catena Aurea · Matthäusevangelium 5
Think not that I am come to destroy the Law, or the Prophets: I am not come to destroy, but to fulfil. For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled. Whosoever therefore shall break one of these least commandments, and shall teach men so, he shall be called the least in the kingdom of heaven: but whosoever shall do and teach them, the same shall be called great in the kingdom of heaven.
And that for two reasons. First, that by these words He might admonish His disciples, that as He fulfilled the Law, so they should strive to fulfil it. Secondly, because the Jews would falsely accuse them as subverting the Law, therefore he answers the calumny beforehand, but in such a manner as that He should not be thought to come simply to preach the Law as the Prophets had done.