Leviticus 23:3

New International Reader's Version Bible (NIRV)
“ ‘There are six days when you can work. But the seventh day is a day of sabbath rest. You must rest on it. Come together on that sacred day. You must not do any work on it. No matter where you live, it is a Sabbath day to honor the Lord.

Passover and Unleavened Bread

Read Leviticus 23:3 in other translations