Book of Enoch (1 Enoch) 79:3
And the waning of the moon which takes place in the sixth portal: for in this sixth portal her light is accomplished, and after that there is the beginning of the waning:
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.