Midrash su Salmi 78:5

[(Gen. 21:1:) THEN THE LORD VISITED SARAH.] There are four keys (rt.: PTH): the key to sustenance, the key to rain, the key to graves, and the key to barren women.¹²⁹Cf. below, Gen. 7:16; Frag. (Jerusalem) Targum, Gen. 30:22; Frag. (Jerusalem) Targum, Deut. 28:11; Ta‘an. 2ab; Sanh. 113a; Gen. R. 72:4; Deut. R. 7:6; PR 42:7; M. Ps. 78:5. Moreover, the four of them are in the hand of the Holy One. Where is it shown about sustenance? Where it is stated (in Ps. 145:16): YOU OPEN (rt.: PTH) YOUR HAND < AND SATISFY THE DESIRE OF EVERY LIVING BEING >. Where is it shown about rain? Where it is stated (in Deut. 28:12): THE LORD WILL OPEN (rt.: PTH) FOR YOU < HIS BOUNTEOUS TREASURY, THE HEAVENS, TO GIVE RAIN FOR YOUR LAND IN ITS SEASON >. Where is it shown about graves? Where it is stated (in Ezek. 37:13): WHEN I HAVE OPENED (rt.: PTH) YOUR GRAVES < AND BROUGHT YOU UP OUT OF YOUR GRAVES >. Where is it shown about barren women? Where it is stated (in Gen. 30:22): THEN THE LORD VISITED RACHEL… AND HE OPENED (rt.: PTH) HER WOMB.