Matthew Henry on Genesis 12:14–end
Here is, I. The danger Sarai was in of having her chastity violated by the king of Egypt: and without doubt the peril of sin is the greatest peril we can be in. Pharaoh's princes (his pimps rather) saw her, and, observing what a comely woman she was, they commended her before Pharaoh, not for that which was really her praise - her virtue and modesty, her faith and piety (these were no excellencies in their eyes), but for her beauty, which they thought too good for the embraces of a subject. They recommended her to the king, and she was presently taken into Pharaoh's house, as Esther into the seraglio of Ahasuerus (Est 2:8), in order to her being taken into his bed. Now we must not look upon…
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when Abram was come into Egypt--It appears from the monuments of that country that at the time of Abram's visit a monarchy had existed for several centuries. The seat of government was in the Delta, the most northern part of the country, the very quarter in which Abram must have arrived. They were a race of shepherd-kings, in close alliance with the people of Canaan.
Adam Clarke on Genesis 12:13
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 Gen 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 Gen 11:29, where Iscah is thought to be the same with Sarai, but the supposition has not a sufficiency of probability to support it.
John Gill on Genesis 12:14
And it came to pass, that, when Abram was come into Egypt,.... To the city of Heliopolis; for there it was that Abram had his abode, as Eupolemus (r) says, when upon the famine he went into Egypt, and where he conversed with the Egyptian priests, and taught them astrology, and other things belonging to it; and of this descent of Abram into Egypt, and teaching astrology, Artapanus (s), another Heathen writer, speaks; Abram, he says, having learned the science of astrology, went first into Phoenicia and taught it the Phoenicians, and afterwards went into Egypt, and taught it there.
The Egyptians beheld the woman, that she was very fair; Abram knew that Sarai was a fair woman; but in the eyes…