Leviticus 23:37
These are the feasts of the LORD, which ye shall proclaim to be holy convocations, to offer an offering made by fire to the LORD, a burnt-offering, and a meat-offering, a sacrifice, and drink-offerings, every thing upon its day:
Leviticus 23:2
Speak to the children of Israel, and say to them, Concerning the feasts of the LORD, which ye shall proclaim to be holy convocations, even these are my feasts.
Leviticus 23:4
These are the feasts of the LORD, holy convocations, which ye shall proclaim in their seasons.
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, and in the feast of weeks, and in the feast of tabernacles: and they shall not appear before the LORD empty:
Ecclesiastes 3:1
To every thing there is a season, and a time to every purpose under the heaven: