Genesis 9:5 establishes God's requirement for bloodshed to be avenged, which the unsolved murder ritual in Deuteronomy implements.

Numbers 35:33 states that blood pollutes the land and requires atonement, directly explaining the purpose of the heifer ritual for unsolved murder.

2 Samuel 21:9 describes atonement for Saul's bloodshed through execution, illustrating the same need to purge bloodguilt from the land as Deuteronomy.

Isaiah 26:21 says the earth will disclose hidden bloodshed, echoing the need for atonement in Deuteronomy's ritual for an unknown murderer.

2 Samuel 3:28 has David declare himself guiltless of Abner's blood, similar to the community's need to clear themselves of bloodguilt in Deuteronomy.

Proverbs 28:17 warns that a murderer burdened with bloodshed flees to the pit, reinforcing the bloodguilt principle behind the unsolved murder ritual.