Sirach 19:15LXX

13Reprove a friend, lest he may not have understood, and say: I did it not: or if he did it, that he may do it no more.

14Reprove thy neighbour, for it may be he hath not said it: and if he hath said it, that he may not say it again.

15Admonish thy friend: for there is often a fault committed.

16And believe not every word. There is one, that slippeth with the tongue, but not from his heart.

17For who is there that hath not offended with his tongue? Admonish thy neighbour before thou threaten him.