Exodus 30:11

When Aaron lights the lamps at evening, he shall burn it, a perpetual incense before the LORD throughout your generations.

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

Aaron 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.”

“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.

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.

Everyone who passes over to those who are counted, from twenty years old and upward, shall give the offering to the LORD.