Sirach 22:20

20 Whoever throws a stone at birds scares them off, and whoever insults a friend breaks up a friendship.

Sirach 22:20 In-Context

18 A protective barrier set on a high place will never endure against the wind. So a timid heart backed up by a fool's plan will never endure against any fear.

19 Whoever pricks an eye will make tears flow, and whoever pricks a heart reveals its feelings.

20 Whoever throws a stone at birds scares them off, and whoever insults a friend breaks up a friendship.

21 If you draw a sword on a friend, don't despair, because there can be a way back.

22 If you speak harshly to a friend, don't be concerned, because there can be reconciliation. But in the case of reproach, arrogance, the revealing of a secret, or a treacherous blow, any friend will flee.