Some readers have accused both Isaac and Rebekah of equal fault in favoring their sons (Esau and Jacob respectively; Gen 27:1-10). But in context of the entire book of Genesis, the motives of the two parents are quite different. Isaac favors the elder son (25:25; 27:4), but the whole patriarchal line suggests that God does not always choose the elder son (21:12; 49:3-4), and paternal favoritism produces problems (37:4); Jacob himself finally learns and practices this in his old age (48:14-20). What are Rebekah’s motives? The clearest clue the text itself provides is in 25:22-23: she had sought God, and God had told her that the younger would prevail. In contrast to Isaac, Rebekah acts on the basis of a word from God. Further, Esau had married pagan wives and sold his birthright, with apparently no sense of responsibility for the call on this family to be God’s blessing to the earth (25:31-34; 26:34-35). In a culture where the husband’s will was law and Isaac was blind to God’s choice, Rebekah took the only route she knew to secure God’s promise.
Genesis is full of accounts that underline for Israel the miracle of their blessing and existence–three barren matriarchs (18:11; 25:21; 30:22), royal abduction or threatening of matriarchs (12:13; 20:2; Isaac repeated his father’s example–26:7), and so on. Elsewhere in Genesis someone other than the patriarch makes a choice, nevertheless leaving the right land to the patriarch (13:9-13; 36:6-8). In the context of the themes the entire book emphasizes, it is consistent to believe that God worked through Rebekah’s deception, as he worked through a variety of other means,
This is not to say that the deception was God’s preferred means to accomplish this, though he sometimes blessed deception when it would save human life from unjust oppressors (Ex 1:18-21; Josh 2:5-6; 1 Sam 16:1-3; 2 Sam 17:19-20; 2 Kings 8:10; Jer 38:24-27). As Jacob stole his brother’s birthright through deception, so he is deceived through two sisters. When Isaac asked Jacob his name, he lied to get the blessing (Gen 27:18-19), hence incurring his brother’s murderous anger (27:41). His mother promised to send for him when it proved safe to return (27:45), but apparently she died in the meantime hence could not send for him, so when he is returning he expects that Esau still desires to kill him (32:11). Thus he struggles all night with the Lord or his agent, and he is confronted with his past. This time, before he can receive the blessing from God, he is asked his name and must tell the truth (32:26-27; and then gets a new name–32:28), in contrast to the time he sought his father’s blessing (27:18-19). But God was with Jacob even in spite of himself; he met angels both going from (28:12) and returning to (32:2) the land. In this story, though Isaac outlives Rebekah, she was the one with the greater perception of God’s purposes for their descendants.