Sirach 30:10

10 Don't laugh together with them, so that you don't suffer together and in the end grind your teeth in regret.

Sirach 30:10 In-Context

8 A horse that is unbroken turns out stubborn, and a child, when given free rein, turns out reckless.

9 Indulge children, and they will terrorize you; play with them, and they will grieve you.

10 Don't laugh together with them, so that you don't suffer together and in the end grind your teeth in regret.

11 Don't give them free rein in their youth.

12 Bruise their sides while they are still young, or else they will become stubborn and disobey you.