Book of Enoch (1 Enoch) 74:7
And when the sun goes forth from the fourth portal she goes forth seven days, until she goes forth from the fifth and turns back again in seven days into the fourth portal and accomplishes all her light: and she recedes and enters into the first portal in eight days.
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.