Numbers 3:13 establishes that all firstborn belong to God because he redeemed them at the Exodus—this is the basis for giving them to the priests in Numbers 18:15.

Numbers 3:41 states the Levites are taken instead of the firstborn, directly linking to the redemption principle here.

Numbers 3:46 specifies the redemption price for the surplus firstborn, elaborating on the redemption commanded here.

Exodus 13:2 commands consecrating all firstborn to the Lord—Numbers 18:15 then assigns these consecrated firstborn to the priests.

Exodus 13:12 repeats the command to set apart firstborn livestock—Numbers 18:15 gives these firstborn to the priests as their portion.

Exodus 13:13 commands redeeming firstborn donkeys and sons—Numbers 18:15 gives that redemption money to the priests.

Exodus 22:29 commands giving firstborn sons to God—Numbers 18:15 specifies that those firstborn (or their redemption) go to the priests.

Exodus 34:20 provides redemption rules for firstborn donkeys and sons—Numbers 18:15 gives the redemption price to the priests.

Leviticus 27:26 says firstborn animals already belong to the Lord and cannot be dedicated—Numbers 18:15 then gives those firstborn to the priests.

Leviticus 27:27 provides the valuation and redemption rules for unclean animals, expanding on the redemption mentioned here.

Nehemiah 10:36 cites this law, showing the ongoing practice of bringing firstborn to priests as commanded.

Luke 2:23 quotes the law that firstborn males are holy to the Lord, directly referencing this principle.

Exodus 34:19 declares firstborn belong to the LORD, while here they are given to priests—a complementary allocation.

Deuteronomy 15:19 commands dedicating firstborn males, aligning with their assignment to priests here.