Numbers 35:20-23

35:20 “But if he strikes him out of hatred or throws something at him intentionally ¹  so that he dies, 35:21 or with enmity he strikes him with his hand and he dies, the one who struck him must surely be put to death, for he is a murderer. The avenger of blood must kill the murderer when he meets him.

35:22 “But if he strikes him suddenly, without enmity, or throws anything at him unintentionally, 35:23 or with any stone large enough that a man could die, without seeing him, and throws it at him, and he dies, even though he was not his enemy nor sought his harm,

[35:20]  ¹ tn The Hebrew text is more vivid: “by lying in wait.”