Mandatory Annual Pilgrimages

Deuteronomy 16:16-17

Three times in a year shall all thy males appear before the Lord thy God in the place which he shall choose: in the feast of unleavened bread, in the feast of weeks, and in the feast of tabernacles. No one shall appear with his hands empty before the Lord:

But every one shall offer according to what he hath, according to the blessing of the Lord his God, which he shall give him.