Midrasch zu Bereschit 29:23

(Ibid., cont.:) BUT RACHEL HAD A LOVELY FORM AND WAS LOVELY TO LOOK AT. Why? Because it is stated (in Prov. 15:30): GOOD NEWS PUTS FAT ON THE BONES. He (Esau) took no action. Rather (in Gen. 28:9): ESAU WENT TO ISHMAEL AND TOOK MAHALATH BAT ISHMAEL < BEN ABRAHAM, THE SISTER OF NEBAIOTH, FOR A WIFE >. Jacob said: Because of the blessings he wanted to kill me; so when I take his wife Leah, who knows if he will leave Mahalath bat Ishmael, come against me, and say: Was it not enough for you to take my birthright and my blessing, that you have taken my betrothed as well! He therefore said to Laban (in Gen. 29:18): I SHALL SERVE YOU SEVEN YEARS FOR < YOUR YOUNGER DAUGHTER > RACHEL. Apart from such a situation, would a man taking a wife leave the older and take the younger?³⁵Since daughters inherit in the absence of sons (Numb. 27:8), the elder daughter would receive the double inheritance of the first-born. See Deut. 21:15-17. Rather < the story is > to teach you that, since Leah was sitting around because of Esau, Jacob said to Laban (ibid.): I SHALL SERVE YOU SEVEN YEARS FOR < YOUR YOUNGER DAUGHTER > RACHEL. Now, when Laban saw that, he said: See here, I am giving away the elder immediately. (Gen. 29:23:) AND, WHEN IT WAS EVENING, HE TOOK HIS DAUGHTER LEAH < AND BROUGHT HER TO HIM >. Jacob said to him: Now were these the terms?³⁶Cf. Gen. R. 70:17. (Gen. 29:25, 26, 28:) DID I NOT SERVE WITH YOU FOR RACHEL? THEN LABAN SAID: IT IS NOT THE CUSTOM IN OUR PLACE…. SO JACOB DID THUS, < AND COMPLETED THE BRIDAL WEEK OF THIS DAUGHTER; THEN LABAN GAVE HIM HIS DAUGHTER RACHEL FOR A WIFE >. He began to love her more than Leah. The Holy One said: Look, I am giving Leah children so that she may be more beloved than Rachel. (Gen. 29:31:) WHEN THE LORD SAW THAT LEAH WAS HATED, HE OPENED HER WOMB.