Book of Enoch (1 Enoch) 79:4
〈And the waning〉 which takes place in the first portal in its season, till one hundred and seventy-seven days are accomplished: reckoned according to weeks, twenty-five (weeks) and two 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.