Deuteronomy 16:4

4 Nothing dighted with sourdough shall appear in all thy coasts by seven days, and of the flesh of that that is offered in the eventide, (that is, of the lamb of the pask,) shall not dwell in the first day in the morrowtide. (Nothing made with yeast shall appear in all thy land for seven days, and none of the flesh of what is offered in the evening, that is, of the Passover lamb, shall remain past the first day, into the next 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 And thou shalt offer pask to thy Lord God, of sheep, and of oxen, in the place which thy Lord God choose, that his name dwell there. (And thou shalt offer the Passover to the Lord thy God, yea, a sheep, or an ox, in the place which the Lord thy God shall choose, that his name shall be there.)

3 Thou shalt not eat therein bread dighted with sourdough; in seven days thou shalt eat bread of affliction, (that is) without sourdough, for suddenly, either hastily, thou wentest out of Egypt, that thou have mind of the day of thy going out of Egypt, in all the days of thy life. (Thou shalt not eat it with any bread made with yeast; yea, for seven days thou shalt eat the bread of affliction, that is, bread made without yeast, for suddenly, or hastily, thou wentest out of Egypt, so that thou shalt remember the day of thy going out of Egypt, all the days of thy life.)

4 Nothing dighted with sourdough shall appear in all thy coasts by seven days, and of the flesh of that that is offered in the eventide, (that is, of the lamb of the pask,) shall not dwell in the first day in the morrowtide. (Nothing made with yeast shall appear in all thy land for seven days, and none of the flesh of what is offered in the evening, that is, of the Passover lamb, shall remain past the first day, into the next morning.)

5 Thou shalt not be able to offer pask in each of thy cities which thy Lord God shall give to thee, (Thou shalt not offer the Passover in all the cities which the Lord thy God shall give thee,)

6 but in the place which thy Lord God choose, that his name dwell there; thou shalt offer pask in the eventide, at the going down of the sun, when thou wentest out of Egypt. (but only in the place which the Lord thy God shall choose, that his name shall be there; thou shalt offer the Passover there in the evening, at the going down of the sun, the time when thou wentest out of Egypt.)