Leviticus 23:5-8 The Passover to the LORD begins at twilight on the fourteenth day of the first month.

BSB⁽ⁱ⁾ ⁵ The Passover to the LORD begins at twilight on the fourteenth day of the first month. ⁶ On the fifteenth day of the same month begins the Feast of Unleavened Bread to the LORD. For seven days you must eat unleavened bread. ⁷ On the first day you are to hold a sacred assembly; you are not to do any regular work. ⁸ For seven days you are to present an offering made by fire to the LORD. On the seventh day there shall be a sacred assembly; you must not do any regular work.’”