Deuteronomy 4:42

so that the slayer might flee there, he who should kill his neighbor through error and who did not hate him in times past, and he fleeing to one of these cities might live.

Numbers 35:6

And among the cities which you shall give to the Levites there shall be six cities for refuge, which you shall appoint for the manslayer, so that he may flee there. And you shall add forty-two cities to them.

Numbers 35:11-12

then you shall choose cities to be cities of refuge for you, so that the slayer who kills any person through error may flee there.

Numbers 35:15-28

These six cities shall be a refuge for the sons of Israel, and for the stranger, and for anyone who stays among them, so that everyone who kills any person through error may flee there.

Deuteronomy 19:1-10

When Jehovah your God has cut off the nations whose land Jehovah your God gives you, and when you take their place and live in their cities and in their houses,

Hebrews 6:18

so that by two immutable things, in which it was impossible for God to lie, we might have a strong consolation, who have fled for refuge to lay hold upon the hope set before us,

Treasury of Scripture Knowledge

Summary

That the slayer might flee thither, which should kill his neighbour unawares, and hated him not in times past; and that fleeing unto one of these cities he might live:

Bible References

General references

Deuteronomy 19:1
When Jehovah your God has cut off the nations whose land Jehovah your God gives you, and when you take their place and live in their cities and in their houses,
Numbers 35:6
And among the cities which you shall give to the Levites there shall be six cities for refuge, which you shall appoint for the manslayer, so that he may flee there. And you shall add forty-two cities to them.
Hebrews 6:18
so that by two immutable things, in which it was impossible for God to lie, we might have a strong consolation, who have fled for refuge to lay hold upon the hope set before us,