You have heard that it was said by them of old time, You shall not kill; and whosoever shall kill shall be in danger of the judgment:
All Commentaries on Matthew 5:21 Go To Matthew 5
John Chrysostom
AD 407
And yet it was Himself who gave those laws also, but so far He states them impersonally. For if on the one hand He had said, You have heard that I said to them of old, the saying would have been hard to receive, and would have stood in the way of all the hearers. If again, on the other hand, after having said, You have heard that it was said to them of old by my Father, He had added, But I say, He would have seemed to be taking yet more on Himself.
Wherefore He has simply stated it, making out thereby one point only; the proof that in fitting season He had come saying these things. For by the words, It was said to them of old, He pointed out the length of the time, since they received this commandment. And this He did to shame the hearer, shrinking from the advance to the higher class of His commandments; as though a teacher should say to a child that was indolent, Do you not know how long a time you have consumed in learning syllables? This then He also covertly intimates by the expression, them of old time, and thus for the future summons them on to the higher order of His instructions: as if He had said, You are learning these lessons long enough, and you must henceforth press on to such as are higher than these.
And it is well that He does not disturb the order of the commandments, but begins first with that which comes earlier, with which the law also began. Yea, for this too suits with one showing the harmony between them.