Genesis 4:14

4:14 Look! You are driving me off the land today, and I must hide from your presence. I will be a homeless wanderer on the earth; whoever finds me will kill me.”

Numbers 35:19

35:19 The avenger of blood himself must kill the murderer; when he meets him, he must kill him.

Deuteronomy 19:12

19:12 The elders of his own city must send for him and remove him from there to deliver him over to the blood avenger to die.