Book of Enoch (1 Enoch) 78:6
And when the moon rises one-fourteenth part appears in the heaven: [the light becomes full in her]: on the fourteenth day she accomplishes her light.
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.