Deuteronomy 16:16-17

16:16 Three times a year all your males must appear before the Lord your God in the place he chooses for the Festival of Unleavened Bread, the Festival of Weeks, and the Festival of Temporary Shelters; and they must not appear before him empty-handed. 16:17 Every one of you must give as you are able, according to the blessing of the Lord your God that he has given you.

Exodus 23:16-17

23:16 “You are also to observe the Feast of Harvest, the firstfruits of your labors that you have sown in the field, and the Feast of Ingathering at the end of the year when you have gathered in your harvest out of the field. 23:17 At three times in the year all your males will appear before the Lord God.

Exodus 34:24

34:24 For I will drive out the nations before you and enlarge your borders; no one will covet your land when you go up to appear before the Lord your God three times in the year.

Psalms 84:7

84:7 They are sustained as they travel along;

each one appears before God in Zion.