2 Esdras 4:7–8

7 And he said to me, “If I had asked you, ‘How many dwellings are in the heart of the sea, or how many streams are at the source of the deep, or how many streams are above the firmament, or which are the exits of hell, or which are the entrances of paradise?’ 8 Perhaps you would have said to me, ‘I never went down into the deep, nor as yet into hell, neither did I ever ascend into heaven.’