Kommentar zu Bereschit 12:19

קח ולך TAKE HER AND GO AWAY — Not as Abimelech who said to him (Genesis 20:15) “Behold, my land is before thee; dwell wherever it seemeth proper to thee”: but he (Pharaoh) said to him, “Go and do not stay here,” for the Egyptians are greatly addicted to lewd-living, as it is said. (Ezekiel 23:20). “And whose issue is like the issue of horses” (Midrash Tanchuma, Lech Lecha 5). (The passage deals with the immoral practices of the Egyptians).

SO THAT I TOOK HER TO BE MY WIFE. The meaning thereof is that it was Pharaoh’s intention that she be his regal wife, not just his concubine. Pharaoh mentioned this to Abraham so that he should confess to him if she is his sister, as I have explained.

?למה אמרת אחותי היא, even after she had already been brought to my palace?