Leviticus 23:37
These are the feasts of Jehovah which you shall proclaim to be holy convocations, to offer a fire offering to Jehovah, a burnt offering and a food offering, a sacrifice, and drink offerings, everything on its day;
Leviticus 23:2
Speak to the sons of Israel and say to them, The feasts of Jehovah, which you shall proclaim, holy convocations, even these are My appointed feasts.
Leviticus 23:4
These are the appointed feasts of Jehovah, holy convocations which you shall proclaim in their appointed seasons.
Deuteronomy 16:16-17
Three times in a year shall all your males appear before Jehovah your God in the place which He shall choose: in the Feast of Unleavened Bread, and in the Feast of Weeks, and in the Feast of Tabernacles. And they shall not appear before Jehovah empty,
Ecclesiastes 3:1
To every thing there is a season, and a time for every purpose under the heavens: