Genesis 26:6

Protection of Rebekah at Gerar. - As Abraham had declared his wife to be his sister both in Egypt and at Gerar, so did Isaac also in the latter place. But the manner in which God protected Rebekah was very different from that in which Sarah was preserved in both instances. Before any one had touched Rebekah, the Philistine king discovered the untruthfulness of Isaac's statement, having seen Isaac "sporting with Rebekah," sc., in a manner to show that she was his wife; whereupon he reproved Isaac for what he had said, and forbade any of his people to touch Rebekah on pain of death. Whether this was the same Abimelech as the one mentioned in Gen 20 cannot be decided with certainty. The name proves nothing, for it was the standing official name of the kings of Gerar (cf. Sa1 21:11 and Ps 34), as Pharaoh was of the kings of Egypt. The identity is favoured by the pious conduct of Abimelech in both instances; and no difficulty is caused either by the circumstance that 80 years had elapsed between the two events (for Abraham had only been dead five years, and the age of 150 was no rarity then), or by the fact, that whereas the first Abimelech had Sarah taken into his harem, the second not only had no intention of doing this, but was anxious to protect her from his people, inasmuch as it would be all the easier to conceive of this in the case of the same king, on the ground of his advanced age.

Isaac had now laid aside all thoughts of going to Egypt, and, in obedience to the heavenly vision, sets up his staff in Gerar, the country in which he was born (Gen 26:6), yet there he enters into temptation, the same temptation that his good father had been once and again surprised and overcome by, namely, to deny his wife, and to give out that she was his sister. Observe, I. How he sinned, Gen 26:7. Because his wife was handsome, he fancied the Philistines would find some way or other to take him off, that some of them might marry her; and therefore she must pass for his sister. It is an unaccountable thing that both these great and good men should be guilty of so strange a piece of dissimulation, by which they so much exposed both their own and their wives' reputation. But we see, 1. That very good men have sometimes been guilty of very great faults and follies. Let those therefore that stand take heed lest they fall, and those that have fallen not despair of being helped up again. 2. That there is an aptness in us to imitate even the weaknesses and infirmities of those we have a value for. We have need therefore to keep our foot, lest, while we aim to tread in the steps of good men, we sometimes tread in their by-steps. II. How he was detected, and the cheat discovered, by the king himself. Abimelech (not the same that was in Abraham's days, ch. 20, for this was nearly 100 years after that, but this was the common name of the Philistine kings, as Caesar of the Roman emperors) saw Isaac more familiar and pleasant with Rebekah than he knew he would be with his sister (Gen 26:8): he saw him sporting with her, or laughing; it is the same word with that from which Isaac has his name. He was rejoicing with the wife of his youth, Pro 5:18. It becomes those in that relation…

26:6-11 While staying in Gerar, Isaac, like his father, deceived people into believing that his wife was his sister. Some suppose that this story duplicates the stories of Abraham’s deception (12:10-20; 20:1-18), but the differences are greater than the similarities, and the son’s repetition of his father’s lie is natural. Through numerous parallels with Abraham, ch 26 shows how God’s plan continued with Isaac. Even when Isaac jeopardized the covenant as his father had, God prevented disaster and preserved the marriage. Abraham’s descendants would be blessed because of Abraham, but they had to exercise their own faith to enjoy the blessings. Genuine faith in God’s promises engenders a fearless walk with him; cowering in fear endangers the blessing and mocks the faith.