You must redeem every firstborn donkey with a lamb, and if you do not redeem it, you are to break its neck. And every firstborn of your sons you must redeem.
The firstborn of clean beasts must be sacrificed, and the unclean redeemed with a lamb or destroyed; whatever is unclean by nature, unredeemed, will be destroyed. Your children are polluted too and must be redeemed by blood, that they may belong to the Church of the Firstborn, just as you were delivered by God's hand from the destroying angel.
AI summary
Commenting on Exodus 13:11-16
And every firstling of an ass thou shalt redeem with a lamb,.... Which was given to the priest for it; and according to the Jewish canon (f), it might be redeemed with that only;"not with a calf, nor with an animal (a goat or a ram, as Bartenora interprets it), nor with a lamb slain, or torn to pieces.''Jarchi thinks the ass only was to...
And every firstling of an ass thou shalt redeem with a lamb; and if thou wilt not redeem it, then thou shalt break his neck: and all the firstborn of man among thy children shalt thou redeem. (g) This is also understood about the horse and other beasts which were not offered in sacrifice. (h) By offering a clean beast in sacrifice; .