Exodus 30:15 WEB

¹³  They shall give this, everyone who passes over to those who are numbered, half a shekel after the shekel of the sanctuary; (the shekel is twenty gerahs;) half a shekel for an offering to Yahweh.

¹⁴  Everyone who passes over to those who are numbered, from twenty years old and upward, shall give the offering to Yahweh.

¹⁵  The rich shall not give more, and the poor shall not give less, than the half shekel, when they give the offering of Yahweh, to make atonement for your souls.

¹⁶  You shall take the atonement money from the children of Israel, and shall appoint it for the service of the tent of meeting; that it may be a memorial for the children of Israel before Yahweh, to make atonement for your souls.'

¹⁷  Yahweh spoke to Moses, saying,