“But every first-born of a donkey you are to ransom with a lamb. And if you do not ransom it, then you shall break its neck. And every first-born of man among your sons you are to ransom.
‘And it came to be, when Pharaoh was too hardened to let us go, that יהוה killed every first-born in the land of Mitsrayim, both the first-born of man and the first-born of beast. Therefore I am slaughtering to יהוה every male that open the womb, but every first-born of my sons I ransom.’