Commentaries:
Barnes' Notes
The upper door post - Or lintel, Exodus 12:23. This direction was understood by the Hebrews to apply only to the first Passover: it was certainly not adopted in Palestine. The meaning of the sprinkling of blood is hardly open to question. It was a representation of the offering of the life, substituted for that of the firstborn in each house, as an expiatory and vicarious sacrifice.
Other Barnes' Notes entries containing Exodus 12:7:
Exodus 23:14-17
Exodus 23:18
Deuteronomy 6:8-9
Deuteronomy 16:1-8
Joshua 2:18
Matthew 12:1
Matthew 23:5
Matthew 26:2
John 1:29
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