Good News Translation
Seat an enemy at your right hand, and the next thing you know he'll be trying to get your own place of honor. Put him next to you, and he will overthrow you. Then you will realize the truth of my words, and be stung with regret when you remember them.

New Revised Standard Version
Do not put him next to you, or he may overthrow you and take your place. Do not let him sit at your right hand, or else he may try to take your own seat, and at last you will realize the truth of my words, and be stung by what I have said.

Contemporary English Version
Don't make them your partners, or they will push you aside and take over. Then you will know I was right, and you will feel the sting of my words.

New American Bible
Do not let them stand near you, lest they push you aside and take your place. Do not let them sit at your right hand, or they will demand your seat, And in the end you will appreciate my advice, when you groan with regret, as I warned.

Douay-Rheims Bible
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.

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.

Sirach 12:10
Never trust thy enemy for as a brass pot his wickedness rusteth:

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

Sirach 12:13
Who will pity an enchanter struck by a serpent, or any that come near wild beasts? so is it with him that keepeth company with a wicked man, and is involved in his sins.

Sirach 12:14
For an hour he will abide with thee: but if thou begin to decline, he will not endure it.