Commentaries:
Barnes' Notes
A lamb - The Hebrew word is general, meaning either a sheep or a goat - male or female - and of any age; the age and sex are therefore epecially defined in the following verse. The direction to select the lamb on the tenth day, the fourth day before it was offered, was intended to secure due care in the preparation for the great national festival. The custom certainly fell into desuetude at a later period, but probably not before the destruction of the temple.
Other Barnes' Notes entries containing Exodus 12:3:
Exodus 23:14-17
Deuteronomy 16:1-8
Psalms 74:2
Psalms 81:4
Joel 1:14
Matthew 12:1
Matthew 23:5
Matthew 26:2
John 1:29
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