Exodus 30:11

9You shall offer no strange incense on it, nor burnt offering, nor meal offering; and you shall pour no drink offering on it.

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

11The 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.

13They 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.