Origen
Catena Aurea · Matthäusevangelium 23
Then spake Jesus to the multitude, and to his disciples, Saying, The Scribes and the Pharisees sit in Moses’ seat: All therefore whatsoever they bid you observe, that observe and do; but do not ye after their works: for they say, and do not. For they bind heavy burdens and grievous to be borne, and lay them on men’s shoulders; but they themselves will not move them with one of their fingers.
But if the Scribes and Pharisees who sit in Moses’ seat are the teachers of the Jews, teaching the commandments of the Law according to the letter, how is this that the Lord bids us do after all things which they say; but the Apostles in the Acts forbid the believers to do according to the letter of the Law.(Acts 15:19.) These indeed taught after the letter, not understanding the Law spiritually. Whatsoever they say to us out of the Law, with understanding of its sense, that we do and keep, not doing after their works, for they do not what the law enjoins, nor perceive the veil that is upon the letter of the Law. Or by all we are not to understand every thing in the Law, many things for example relating to the sacrifices, and the like, but such as concern our conduct. But why did He command this not of the Law of grace, but of the doctrine of Moses? Because truly it was not the time to publish the commandments of the New Law before the season of His passion. I think also that He had herein something further in view. He was about to bring many things against the Scribes and Pharisees in His discourse following, wherefore that vain men might not think that He coveted their place of authority, or spoke thus out of enmity to them, he first puts away from Himself this suspicion, and then begins to reprove them, that the people might not fall into their faults; and that, because they ought to hear them, they should not think that therefore they ought to imitate them in their works, He adds, But do ye not after their works. What can be more pitiable than such a teacher, whose life to imitate is ruin, to refuse to follow is salvation for his disciples?