Numbers 35:6
6 “The cities that you give to the Levites shall be uthe six cities of refuge, where you shall permit the manslayer to flee, and in addition to them you shall give forty-two cities.
Numbers 35:12
12 The cities shall be for you a refuge from the avenger, that the manslayer may not die until he stands before the congregation for judgment.
Numbers 35:22
22 “But if he pushed him suddenly without enmity, or hurled anything on him gwithout lying in wait
Numbers 35:23
23 or used a stone that could cause death, and without seeing him dropped it on him, so that he died, though he was not his enemy and did not seek his harm,