Adam Clarke's Commentary on the Bible - 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 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... read more
Adam Clarke's Commentary on the Bible - Genesis 12:11
Thou art a fair woman to look upon - Widely differing in her complexion from the swarthy Egyptians, and consequently more likely to be coveted by them. It appears that Abram supposed they would not scruple to take away the life of the husband in order to have the undisturbed possession of the wife. The age of Sarai at this time is not well agreed on by commentators, some making her ninety, while others make her only sixty-five. From Genesis 17:17 , we learn that Sarai was ten years younger... read more