Commentaries:
Adam Clarke
Say, I pray thee, thou art my sister - Abram did not wish his wife to tell a falsehood, but he wished her to suppress a part of the truth. From Genesis 20:12, it is evident she was his step-sister, i.e., his sister by his father, but by a different mother. Some suppose Sarai was the daughter of Haran, and consequently the grand-daughter of Terah: this opinion seems to be founded on Genesis 11:29, where Iscah is thought to be the same with Sarai, but the supposition has not a sufficiency of probability to support it.
Other Adam Clarke entries containing Genesis 12:13:
Genesis 20:12
Leviticus 16:21
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