Exodus 30:10-16

30:10 Aaron is to make atonement on its horns once in the year with some of the blood of the sin offering for atonement; once in the year he is to make atonement on it throughout your generations. It is most holy to the Lord.”

The Ransom Money

30:11 The Lord spoke to Moses: 30:12 “When you take a census of the Israelites according to their number, then each man is to pay a ransom for his life to the Lord when you number them, so that there will be no plague among them when you number them. 30:13 Everyone who crosses over to those who are numbered is to pay this: a half shekel according to the shekel of the sanctuary (a shekel weighs twenty gerahs). The half shekel is to be an offering to the Lord. 30:14 Everyone who crosses over to those numbered, from twenty years old and up, is to pay an offering to the Lord. 30:15 The rich are not to increase it, and the poor are not to pay less than the half shekel when giving the offering of the Lord, to make atonement for your lives. 30:16 You are to receive the atonement money from the Israelites and give it for the service of the tent of meeting. It will be a memorial for the Israelites before the Lord, to make atonement for your lives.”