Book of Enoch (1 Enoch) 83:10
After that I arose and prayed and implored and besought, and wrote down my prayer for the generations of the world, and I will show everything to thee, my son Methuselah.
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.