Deuteronomy 16:16-17

“Three times a year all your males shall appear before the LORD your God at the place that he will choose: at the Feast of Unleavened Bread, at the Feast of Weeks, and at the Feast of Booths. They shall not appear before the LORD empty-handed. Every man shall give as he is able, according to the blessing of the LORD your God that he has given you.