Book of Enoch (1 Enoch) 73:8
And she rises on that day with exactly a seventh part, and comes forth and recedes from the rising of the sun, and in her remaining days she becomes bright in the (remaining) thirteen parts.
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.