Deuteronomy 16:4

4 and there is not seen with thee leaven in all thy border seven days, and there doth not remain of the flesh which thou dost sacrifice at evening on the first day till 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 hast sacrificed a passover to Jehovah thy God, of the flock, and of the herd, in the place which Jehovah doth choose to cause His name to tabernacle there.
3 `Thou dost not eat with it any fermented thing, seven days thou dost eat with it unleavened things, bread of affliction; for in haste thou hast come out of the land of Egypt; so that thou dost remember the day of thy coming out of the land of Egypt all days of thy life;
4 and there is not seen with thee leaven in all thy border seven days, and there doth not remain of the flesh which thou dost sacrifice at evening on the first day till morning.
5 `Thou art not able to sacrifice the passover within any of thy gates which Jehovah thy God is giving to thee,
6 except at the place which Jehovah thy God doth choose to cause His name to tabernacle -- there thou dost sacrifice the passover in the evening, at the going in of the sun, the season of thy coming out of Egypt;
Young's Literal Translation is in the public domain.