Good News Translation
Don't tell it to your friends or your enemies unless it would be sinful to keep it to yourself.

New Revised Standard Version
With friend or foe do not report it, and unless it would be a sin for you, do not reveal it;

Contemporary English Version
So don't tell it to your enemies or even your friends, unless you would be doing wrong by not speaking up.

New American Bible
Tell nothing to friend or foe; and unless it be a sin for you, do not reveal a thing.

Douay-Rheims Bible
Tell not thy mind to friend or foe: and if there be a sin with thee, disclose it not.

Tell not thy mind to friend or foe: and if there be a sin with thee, disclose it not.

Sirach 19:6
He that sinneth against his own soul, shall repent: and he that is delighted with wickedness, shall be condemned.

Sirach 19:7
Rehearse not again a wicked and harsh word, and thou shalt not fare the worse.

Sirach 19:9
For he will hearken to thee, and will watch thee, and as it were defending thy sin he will hate thee, and so will he be with thee always.

Sirach 19:10
Hast thou heard a word against thy neighbour? let it die within thee, trusting that it will not burst thee.