Commentaries:
Adam Clarke
He that is eight days old - Because previously to this they were considered unclean, Leviticus 12:2, Leviticus 12:3, and circumcision was ever understood as a consecration of the person to God. Neither calf, lamb, nor kid, was offered to God till it was eight days old for the same reason, Leviticus 22:27.
Other Adam Clarke entries containing Genesis 17:12:
Exodus 12:40
Luke 1:59
Luke 2:21
Romans 4:11
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