Sirach 27:27

27 He that worketh mischief, it shall fall upon him, and he shall not know whence it cometh.

Sirach 27:27 In-Context

25 Whoso casteth a stone on high casteth it on his own head; and a deceitful stroke shall make wounds.

26 Whoso diggeth a pit shall fall therein: and he that setteth a trap shall be taken therein.

27 He that worketh mischief, it shall fall upon him, and he shall not know whence it cometh.

28 Mockery and reproach are from the proud; but vengeance, as a lion, shall lie in wait for them.

29 They that rejoice at the fall of the righteous shall be taken in the snare; and anguish shall consume them before they die.