Leviticus 23:2-4

23:2 “Speak to the Israelites and tell them, ‘These are the Lord’s appointed times which you must proclaim as holy assemblies – my appointed times:

The Weekly Sabbath

23:3 “‘Six days work may be done, but on the seventh day there must be a Sabbath of complete rest, a holy assembly. You must not do any work; it is a Sabbath to the Lord in all the places where you live.

The Festival of Passover and Unleavened Bread

23:4 “‘These are the Lord’s appointed times, holy assemblies, which you must proclaim at their appointed time.