Midrash su Salmi 105:9

He said to him (in Gen. 24:2): PLEASE PUT YOUR HAND < UNDER MY THIGH >. See how they loved circumcision! And Jacob also, when he had Joseph swear, said to him (in Gen. 47:29): [PLEASE] PUT [YOUR HAND UNDER MY THIGH]. For what reason did they love circumcision? Because they knew that it was going to save their children from Gehinnom in the world to come.²⁶See Gen. R. 48:8; Exod. R. 19:4; Tanh., 5:6; cf. M. Ps. 1:20; 6:1; cf. also Gen. R. 21:9. Thus it is stated (in Is. 5:14): THEREFORE SHEOL HAS OPENED WIDE ITS GULLET [AND PARTED ITS MOUTH < FOR ONE > WITHOUT A STATUTE].²⁷A more traditional translation would read: PARTED ITS MOUTH BEYOND MEASURE. What is the meaning of WITHOUT A STATUTE? There is no statute but circumcision. Thus it is stated (in Ps. 105:9f.): < THE COVENANT > WHICH HE CUT WITH ABRAHAM…. AND WHICH HE ESTABLISHED FOR JACOB AS A STATUTE. But the Israelites, because they are circumcised, are saved from it. Thus it is stated (in Is. 43:2): WHEN YOU PASS THROUGH THE WATERS, < I WILL BE WITH YOU >.