Commentaries:
Jamieson, Fausset, and Brown
the covenant of circumcision—that is, the covenant of which circumcision was the token.
and so—that is, according to the terms of this covenant, on which Paul reasons (Gal. 3:1-26).
the twelve patriarchs—so called as the founders of the twelve tribes of Israel.
four hundred years—using round numbers, as in Genesis 15:13, Genesis 15:16 (see on Galatians 3:17).
Other Jamieson, Fausset, and Brown entries containing Acts 7:8:
Genesis 17:10
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