Midrash su Genesi 31:13

The Holy One, blessed be He, declared: How long shall this righteous man continue to be punished without comprehending the sin for which he is being afflicted? Indeed, I will inform him. And it is written: God said unto Jacob: “Arise, go up to Beth-El, and dwell there” (Gen. 35:1). R. Aibu said: When your sieve is clogged, strike it.⁹A proverb telling us that Jacob’s mind had become clogged, causing him to forget his vow, and so God beat upon it by causing him to suffer. The Holy One, blessed be He, told him: These trials have befallen you only because you have not fulfilled your vow. If you do not wish to experience other afflictions, Arise, go up to Beth-El, dwell there, and erect an altar, at the very place at which you made your vow. I am the God of Beth-El, where thou didst anoint a pillar, where thou didst vow a vow unto Me (ibid. 31:13). R. Abba the son of Kahana stated: The Holy One, blessed be He, said to Jacob: When a man has problems he will make a vow, but when he is enjoying ease and comfort he will quickly disregard his vow. When you were in difficulty you made a vow, but after you attained security you forgot it. Then Jacob said unto his household, and to all that were with him: “Let us arise, and go up to Beth-El” (ibid. 35:2–3).