Midrash sa Genesis 27:44: Midrash Tanchuma Buber, Aggadat Bereshit & Bereshit Rabbah

Another interpretation (of Gen. 29:31): WHEN THE LORD SAW THAT LEAH WAS HATED. < She was hated >, not because she was abhorrent to her husband, but because she had scolded him when Jacob had worked seven years for Rachel. Now his mother had said to him (in Gen. 27:44): AND YOU ARE TO STAY WITH HIM (Laban) FOR A WHILE, and he had stayed seven years. (Gen. 29:21, 23:) THEN JACOB SAID UNTO LABAN: GIVE ME MY WIFE…. AND, WHEN IT WAS EVENING, HE TOOK HIS DAUGHTER LEAH < AND BROUGHT HER TO HIM >. ALL NIGHT SHE PRETENDED TO BE RACHEL. When he arose in the morning (according to Gen. 29:25), THERE WAS LEAH. He said to her: Daughter of a swindler, why did you trick me? She said to him: < What about > you! Why did you trick your father? When he said to you: Is this my son Esau, you said to him (in Gen. 27:19): I AM ESAU YOUR FIRST-BORN. Now you are saying: Why have you tricked me? And did your father not say < to Esau > (in Gen. 27:35): YOUR BROTHER CAME WITH DECEIT? So because of these things with which she scolded him, he began to hate her. The Holy One said: There is no cure for this but sons. Then her husband will desire her. Thus (in Gen. 29:31): WHEN THE LORD SAW THAT LEAH WAS HATED, HE OPENED HER WOMB. David also gives praise (in Ps. 146:7): THE ONE WHO EXECUTES JUSTICE FOR THE OPPRESSED.³³Gen. R. 71:2.

[5] Another interpretation: And God saw who was hated, in the presence of her husband, when he rebuked her. When was this? As it is said, "And Jacob served Rachel for seven years" (Genesis 29:18). This is what his mother Rebekah told him, "And you shall dwell with him for a few days" (Genesis 27:44). And Jacob loved Rachel (Genesis 29:18). And Jacob said to Laban, "Give me my wife" (Genesis 29:21), and it was in the evening, and all night he lay with her, thinking that she was Rachel. When he woke up in the morning, he saw that it was Leah. He said to her, "Why have you deceived me?" She replied, "Didn't you deceive your father when he asked you, 'Are you my son Esau?' and you said, 'I am' (Genesis 27:19)? And when he blessed you, you said, 'Why have you deceived me?' But your father didn't say, 'Your brother Esau came with deceit and took your blessing' (Genesis 27:35)." Because of these things, which rebuked him, he began to hate her. God said, "Her only cure is to have children. I will give her children, and her husband will be humbled before her." Therefore, God saw that Leah was hated (Genesis 29:31). "He opens the womb" (Genesis 29:31). David mocks and says, "He executes justice for the oppressed; He gives food to the hungry. The Lord sets the prisoners free" (Psalms 146:7).

“Now my son, heed my voice and arise, flee to Laban my brother, to Haran” (Genesis 27:43).
“Live with him a few years, until your brother’s anger will subside” (Genesis 27:44).
“Now my son, heed my voice and arise, flee…live with him a few [aḥadim] years.” It is written: “Jacob worked seven years for Rachel; they were in his eyes but a few [aḥadim] days, in his love of her” (Genesis 29:20). Rabbi Ḥanina bar Pazi said: Aḥadim is written here and aḥadim is written elsewhere. Just as elsewhere, aḥadim is seven years, so, too aḥadim that is stated here is seven years.
“Until your brother’s anger will subside from you, and he will forget that which you did to him, and I will send and take you from there; why should I be bereaved of both of you on one day?” (Genesis 27:45).
“Until your brother’s anger will subside” – his mother in her righteousness said: “Until your brother’s anger will subside,” but he did not do so, but rather: “His wrath mauled perpetually and his fury kept forever” (Amos 1:11). Reish Lakish said: His fury and his wrath did not move from his mouth – “why should I be bereaved of both of you?”