Leviticus 23:1

2 Say to the children of Israel, These are the fixed feasts of the Lord, which you will keep for holy meetings: these are my feasts.

3 On six days work may be done; but the seventh day is a special day of rest, a time for worship; you may do no sort of work: it is a Sabbath to the Lord wherever you may be living.

4 These are the fixed feasts of the Lord, the holy days of worship which you will keep at their regular times.

5 In the first month, on the fourteenth day of the month at nightfall, is the Lord's Passover;

6 And on the fifteenth day of the same month is the feast of unleavened bread; for seven days let your food be unleavened bread.

7 On the first day you will have a holy meeting; you may do no sort of field-work.