Numbers 18:15-16
15 (a)(A)Every first issue of the womb of all flesh, whether man or animal, which they offer to the Lord, shall be yours; nevertheless the firstborn of man you shall surely redeem, and the firstborn of unclean animals you shall redeem.
16 As to their redemption price, from a month old you shall redeem them, by your valuation, five (b)shekels in silver, according to the (c)shekel of the sanctuary, which is twenty gerahs.
Footnotes:
a.
Numbers 18:15: ['Lit ', Everything that opens]
b.
Numbers 18:16: ['I.e. A shekel equals approx one-half oz']
c.
Numbers 18:16: ['I.e. A shekel equals approx one-half oz']