Leviticus 23:5-7

Amplified Bible

⁵ The Lord’s Passover is on the fourteenth day of the first month ^[a]at twilight. ⁶ The Feast of Unleavened Bread to the Lord is on the fifteenth day of the same month; for seven days you shall eat unleavened bread.^{(A) 7} On the first day you shall have a holy convocation (calling together); you shall not do any laborious work [on that day].