Exodus 34:19
All that openeth the matrix is mine; and every firstling among thy cattle, whether ox or sheep, that is male.
Cross-reference
Exodus 13:2 is the original command to consecrate firstborn, which this verse repeats.
Exodus 13:12 gives a parallel instruction to set apart firstborn males, reinforcing the same law.
Exodus 22:29 extends the principle to include firstborn sons, linking to the same command.
Numbers 18:15-17 elaborates on redemption rules for firstborn humans and unclean animals, expanding this law.
Luke 2:23 directly quotes this law as the basis for presenting Jesus at the temple.
Numbers 3:13 reaffirms that all firstborn belong to God, citing the Exodus event as the reason.
Deuteronomy 15:19 repeats the command to dedicate firstborn males, with additional detail on not using them for work.
Nehemiah 10:36 reaffirms this law: the community vows to bring firstborn sons and cattle to the temple, applying the same principle.