Leviticus 23:4-6

New Revised Standard Version Catholic Edition

⁴ These are the appointed festivals of the Lord, the holy convocations, which you shall celebrate at the time appointed for them. ⁵ In the first month, on the fourteenth day of the month, at twilight,^[a] there shall be a passover offering to the Lord, ⁶ and on the fifteenth day of the same month is the festival of unleavened bread to the Lord; seven days you shall eat unleavened bread.