Leviticus 23:5-7

AKJV(i) 5 In the fourteenth day of the first month at even is the LORD's passover. 6 And on the fifteenth day of the same month is the feast of unleavened bread to the LORD: seven days you must eat unleavened bread. 7 In the first day you shall have an holy convocation: you shall do no servile work therein.