Book of Enoch (1 Enoch) 93:12
And how should there be one who could behold the heaven, and who is there that could understand the things of heaven and see a soul or a spirit and could tell thereof, or ascend and see all their ends and think them or do like them?
Background and history of Book of Enoch (1 Enoch), and issues with this book.
R. H. Charles, The Book of Enoch (London: SPCK, 1917), public domain. The verse text is the English Wikisource transcription of that translation. Charles’s editorial signs are kept. He rearranges some verses in chapters 5, 39, 90, 91, and 106, so those chapters are not a straight 1, 2, 3 sequence.