Deuteronomy 16:4
And there shall be no leavened bread seen with thee in all thy coast seven days; neither shall there any thing of the flesh, which thou sacrificedst the first day at even, remain all night until the morning.
And there shall be no leavened bread seen with thee in all thy coasts seven days,.... For before the passover they were to search diligently every room in the house, and every hole and crevice, that none might remain any where; see Exodus 12:15,
neither shall there be anything of the flesh, which thou sacrificedst the first day at even, remain all night until the morning; which may be understood both of the flesh of the passover lamb, as Aben Ezra, according to Exodus 12:10 and of the flesh of flocks and herds, or of the Chagigah; according to Jarchi this Scripture speaks of the Chagigah of the fourteenth, which was not to remain on the first day of the feast (the fifteenth) until the morning of the second day (the sixteenth).