Good News Translation
If you hear that a neighbor has said something he shouldn't, ask him about it. Maybe he didn't say it. If he did, he won't say it again.

New Revised Standard Version
Question a neighbor; perhaps he did not say it; or if he said it, so that he may not repeat it.

Contemporary English Version
If they didn't do it, you will find out, and if they did, they won't do it again.

New American Bible
Admonish your neighbor—he may not have said it; and if he did, that he may not say it again.

Douay-Rheims Bible
Reprove thy neighbour, for it may be he hath not said it: and if he hath said it, that he may not say it again.

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

Sirach 19:12
As an arrow that sticketh in a man's thigh: so is a word in the heart of a fool.

Sirach 19:13
Reprove 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.

Sirach 19:15
Admonish thy friend: for there is often a fault committed.

Sirach 19:16
And believe not every word. There is one, that slippeth with the tongue, but not from his heart.