Every man shall give as he is able, according to the blessing of the LORD your God which He has given you.
Deuteronomy 16:17
Surrounding context
16:16 "Three times a year all your males shall appear before the LORD your God in the place which He chooses: at the Feast of Unleavened Bread, at the Feast of Weeks, and at the Feast of Tabernacles; and they shall not appear before the LORD empty- handed.
16:17 Every man shall give as he is able, according to the blessing of the LORD your God which He has given you.
16:18 "You shall appoint judges and officers in all your gates, which the LORD your God gives you, according to your tribes, and they shall judge the people with just judgment.