מדרש על בראשית 10:5

Another interpretation (of Gen. 42:1): THEN JACOB SAW THAT THERE WAS GRAIN (ShBR)…. This text is related (to Ps. 146:5): BLESSED IS THE ONE WHOSE HELP IS THE GOD OF JACOB, WHOSE HOPE (SBR) IS IN THE LORD HIS GOD.²¹Gen. R. 91:1, 6; cf. Tanh., Gen. 10:5. The Holy One showed him that Joseph was alive.