Deuteronomy 4:42
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:
Cross-reference
Deuteronomy 19:1-10 elaborates on the same law of asylum for unintentional killers, providing detailed procedures for the cities of refuge.
Deuteronomy 19:4 restates the same provision for unintentional killing in the context of cities west of the Jordan—parallel legislation.
Numbers 35:6 reveals that these cities of refuge were also assigned to the Levites, combining sanctuary for the manslayer with provision for the priests.
Numbers 35:11 commands the same institution—cities of refuge for unintentional killers—that Moses here establishes east of the Jordan.
Numbers 35:12 explains the refuge's purpose—protection from the avenger until trial—which this verse implies by 'might live'.
Numbers 35:15-28 expands on who may flee and conditions for remaining in the city—details foundational to this verse's context.
Hebrews 6:18 uses the imagery of fleeing to a city of refuge as a metaphor for hope in God's promise—the OT institution prefigures NT assurance.