Leviticus 23:37
"These are the LORD's appointed festivals that you are to proclaim as sacred assemblies. Bring offerings made by fire to the LORD a whole burnt offering, a meal offering, a sacrifice, and drink offerings. Do this every day on its assigned date
Leviticus 23:2
"Tell the Israelis that these are my festival times appointed by the LORD that you are to declare as sacred assemblies:
Leviticus 23:4
These are the LORD's appointed festivals and sacred assemblies that you are to declare at their appointed time.
Deuteronomy 16:16-17
"Every male must appear in the presence of the LORD your God three times a year at the place where he will choose: for the Festival of Unleavened Bread, the Festival of Seven Weeks, and the Festival of Tents. He must not appear in the LORD's presence empty-handed,
Ecclesiastes 3:1
There is a season for everything, and a time for every event under heaven: