Exodus 30:11-16

¹¹The Lord also spoke to Moses, saying, ¹²“When you take a census of the sons of Israel to count them, then each one of them shall give a ransom for himself to the Lord, when you count them, so that there will be no plague among them when you count them. ¹³This is what everyone who is counted shall give: half a shekel according to the shekel of the sanctuary (the shekel is twenty gerahs), half a shekel as a contribution to the Lord. ¹⁴Everyone who is counted, from twenty years old and over, shall give the contribution to the Lord. ¹⁵The rich shall not pay more, and the poor shall not pay less, than the half shekel, when you give the contribution to the Lord to make atonement for yourselves. ¹⁶And you shall take the atonement money from the sons of Israel and give it for the service of the tent of meeting, so that it may be a memorial for the sons of Israel before the Lord, to make atonement for yourselves.”