Deuteronomy 16:4

4 No dough with yeast should appear in any of your territory for seven days. Furthermore, none of the meat that you sacrificed on the first night should remain until morning.

Deuteronomy 16:4 Meaning and Commentary

Deuteronomy 16:4

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 Exodus 12:19 ) ( 13:7 ) ,

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).

Deuteronomy 16:4 In-Context

2 Offer a Passover sacrifice from the flock or herd to the LORD your God at the location the LORD selects for his name to reside.

3 You must not eat anything containing yeast along with it. Instead, for seven days you must eat unleavened bread, bread symbolizing misery, along with it because you fled Egypt in a great hurry. Do this so you remember the day you fled Egypt for as long as you live.

4 No dough with yeast should appear in any of your territory for seven days. Furthermore, none of the meat that you sacrificed on the first night should remain until morning.

5 You are not permitted to offer the Passover sacrifice in any of the cities that the LORD your God is giving you.

6 Instead, you must offer the Passover sacrifice at the location the LORD your God selects for his name to reside, at evening time, when the sun sets, which was the time you fled Egypt.