Ex 13:2

13:2 all the firstborn. Firstborn of humans and cattle were sacred to the Lord. Like the firstfruits of the harvest, the firstborn from the womb represented God’s claim on all. The principle is enunciated here and the details are given at 13:12–16; 22:29, 30; 34:19, 20. Jesus was so presented as Mary’s firstborn (Luke 2:22–23).