Good News Translation
Never trust an enemy; his wickedness is as destructive as rust.

New Revised Standard Version
Never trust your enemy, for like corrosion in copper, so is his wickedness.

Contemporary English Version
Never trust your enemies-- their evil will attack you like rust

New American Bible
Never trust your enemies, for their wickedness is like corrosion in bronze.

Douay-Rheims Bible
Never trust thy enemy for as a brass pot his wickedness rusteth:

Never trust thy enemy for as a brass pot his wickedness rusteth:

Sirach 12:8
A friend shall not be known in prosperity, and an enemy shall not be hidden in adversity.

Sirach 12:9
In the prosperity of a man, his enemies are grieved: and a friend is known in his adversity.

Sirach 12:11
Though he humble himself and go crouching, yet take good heed and beware of him.

Sirach 12:12
Set him not by thee, neither let him sit on thy right hand, lest he turn into thy place, and seek to take thy seat and at the last thou acknowledge my words, and be pricked with my sayings.