Numbers 18:16

Those that are to be redeemed, to wit, of men only, not of unclean beasts last mentioned, as is manifest from the time and price of redemption here mentioned, both which agree to men; the time, Numbers 18:16; the price, Numbers 3:46,47; but neither agree to unclean beasts, which were to be redeemed with a sheep, Exodus 13:13, and that after it was eight days old. According to thine estimation: this belongs either,

1. To the foregoing clause, to this purpose, that whereas women newly delivered of a child continued in their uncleanness either a longer or shorter time, according to the quality of the birth, as it was male or female, Leviticus 12:4,5, and the temper of the mother, the priest was to take that time when he judged the mother to be clean, that so the mother might be purified and the child redeemed at the same time. Or rather,

2. To the following clause, to wit, the price which was to be paid, as appears by comparing this place with Leviticus 27:2,3. And both there and here it is said to be done according to the priest's estimation, though a certain rule be added to guide his estimation, and a certain price set, because the priest was to apply that general rule to each person, and to put that price upon him.