Exodus 30:13-16

Every person who is counted must pay one-fifth of an ounce of silver. (This is set by using one-half of the Holy Place measure, which weighs two-fifths of an ounce.) This amount is a gift to the LORD. Every person who is counted and is twenty years old or older must give this amount to the LORD. A rich person must not give more than one-fifth of an ounce, and a poor person must not give less. You are paying this to the LORD to buy back your lives. Gather from the people of Israel this money paid to buy back their lives, and spend it on things for the service in the Meeting Tent. This payment will remind the LORD that the Israelites’ lives have been bought back.”