Exodus 30:11

7 And Aaron is to burn fragrant incense on it every morning when he tends the lamps.

8 When Aaron sets up the lamps at twilight, he must burn the incense perpetually before the LORD for the generations to come.

9 On this altar you must not offer unauthorized incense or a burnt offering or grain offering; nor are you to pour a drink offering on it.

10 Once a year Aaron shall make atonement on the horns of the altar. Throughout your generations he shall make atonement on it annually with the blood of the sin offering of atonement. The altar is most holy to the LORD.”

11 Then the LORD said to Moses,

12 “When you take a census of the Israelites to number them, each man must pay the LORD a ransom for his life when he is counted. Then no plague will come upon them when they are numbered.

13 Everyone who crosses over to those counted must pay a half shekel, according to the sanctuary shekel, which weighs twenty gerahs. This half shekel is an offering to the LORD.

14 Everyone twenty years of age or older who crosses over must give this offering to the LORD.

15 In making the offering to the LORD to atone for your lives, the rich shall not give more than a half shekel, nor shall the poor give less.

Read all of Exodus 30