Exodus 30:17

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.

16 Take the atonement money from the Israelites and use it for the service of the Tent of Meeting. It will serve as a memorial for the Israelites before the LORD to make atonement for your lives.”

17 And the LORD said to Moses,

18 “You are to make a bronze basin with a bronze stand for washing. Set it between the Tent of Meeting and the altar, and put water in it,

19 with which Aaron and his sons are to wash their hands and feet.

20 Whenever they enter the Tent of Meeting or approach the altar to minister by presenting an offering made by fire to the LORD, they must wash with water so that they will not die.

21 Thus they are to wash their hands and feet so that they will not die; this shall be a permanent statute for Aaron and his descendants for the generations to come.”

Read all of Exodus 30