Leeser(i)
15 Whatever openeth the womb of all flesh, which they bring unto the Lord, be it of men or of cattle, shall be thine: nevertheless thou shalt redeem the first-born of man, and the firstling of the unclean cattle shalt thou redeem.
16 And those that are to be redeemed from a month old shalt thou redeem, according to the usual estimation of five shekels of silver, after the shekel of the sanctuary, which is twenty gerahs.