Sirach 12:10-12

Revised Standard Version

¹⁰ Never trust your enemy,
    for like the rusting of copper, so is his wickedness.
¹¹ Even if he humbles himself and goes about cringing,
    watch yourself, and be on your guard against him;
and you will be to him like one who has polished a mirror,
    and you will know that it was not hopelessly tarnished.
¹² Do not put him next to you,
    lest he overthrow you and take your place;
do not have him sit at your right,
    lest he try to take your seat of honor,
and at last you will realize the truth of my words,
    and be stung by what I have said.