'Firstling' in the Bible

then you must give over to the Lord the first offspring of every womb. Every firstling of a beast that you have -- the males will be the Lord's.

Every firstling of a donkey you must redeem with a lamb, and if you do not redeem it, then you must break its neck. Every firstborn of your sons you must redeem.

Now the firstling of a donkey you may redeem with a lamb, but if you do not redeem it, then break its neck. You must redeem all the firstborn of your sons. "No one will appear before me empty-handed.