Numbers 35:20-22

American Standard Version

²⁰ And if he thrust him of hatred, or hurled at him, lying in wait, so that he died, ²¹ or in enmity smote him with his hand, so that he died; he that smote him shall surely be put to death; he is a murderer: the avenger of blood shall put the murderer to death, when he meeteth him.

²² But if he thrust him suddenly without enmity, or hurled upon him anything without lying in wait,