Sirach 8:19

19 Open not thine heart to every man, lest he requite thee with a shrewd turn.

Sirach 8:19 In-Context

17 Consult not with a fool; for he cannot keep counsel.

18 Do no secret thing before a stranger; for thou knowest not what he will bring forth.

19 Open not thine heart to every man, lest he requite thee with a shrewd turn.