Leviticus 23:37
"These are the appointed feasts of the LORD, which you shall proclaim as times of holy convocation, for presenting to the LORD food offerings, burnt offerings and grain offerings, sacrifices and drink offerings, each on its proper day,
Leviticus 23:2
"Speak to the people of Israel and say to them, These are the appointed feasts of the LORD that you shall proclaim as holy convocations; they are my appointed feasts.
Leviticus 23:4
"These are the appointed feasts of the LORD, the holy convocations, which you shall proclaim at the time appointed for them
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.
Ecclesiastes 3:1
For everything there is a season, and a time for every matter under heaven: