Exodus 30:11-16

11And Jehovah spoke to Moses, saying,

12When thou shalt take the sum of the children of Israel according to those of them that are numbered, then shall they give every man a ransom for his soul to Jehovah on their being numbered, that there be no plague among them on their being numbered.

13This shall they give — every one that passeth among them that are numbered — half a shekel after the shekel of the sanctuary, — twenty gerahs the shekel; a half shekel shall be the heave-offering for Jehovah.

14Every one that passeth among those that are numbered, from twenty years old and above, shall give the heave-offering of Jehovah.

15The rich shall not give more, and the poor shall not give less than half a shekel, when ye give the heave-offering of Jehovah, to make atonement for your souls.

16And thou shalt take the atonement-money of the children of Israel, and devote it to the service of the tent of meeting; and it shall be a memorial to the children of Israel before Jehovah, to make atonement for your souls.