Exodus 30:11-16

11Then the Lord said to Moses,

12“When you take the census of the Israelites, each one shall give a ransom for himself to the Lord when you count them, so that no plague will come on them when you number them.

13This is what everyone who is counted shall give [as he joins those already counted]: a half shekel, according to the sanctuary shekel (the shekel is twenty gerahs); a half shekel as a contribution to the Lord.

14Everyone who is counted, from twenty years old and over, [as he joins those already counted], shall give this contribution to the Lord.

15The rich shall not give more and the poor shall not give less than half a shekel, when you give this contribution to the Lord to make atonement for yourselves.

16You shall take the atonement money from the Israelites and use it [exclusively] for the service of the Tent of Meeting, so that it may be a memorial for the Israelites before the Lord, to make atonement for yourselves.”