Exodus 30:12 in the King James Version
When thou takest the sum of the children of Israel after their number, then shall they give every man a ransom for his soul unto the LORD, when thou numberest them; that there be no plague among them, when thou numberest them.
Context
11 The LORD spoke to Moses, saying,
12 “When you take a census of the children of Israel, according to those who are counted among them, then each man shall give a ransom for his soul to the LORD when you count them, that there be no plague among them when you count them.
13 They shall give this, everyone who passes over to those who are counted, half a shekel according to the shekel of the sanctuary (the shekel is twenty gerahs); half a shekel for an offering to the LORD.