Secrets of Enoch (2 Enoch, Slavonic Enoch) 16:6
The fourth part (of one day) is neglected during three years and the fourth year completes it exactly. On account of this they are omitted from the heavens during three years, and are not added to the number of the days, on which account these change the seasons of the year in two new months, to make the number complete and there are two others to diminish.
Background and history of Secrets of Enoch (2 Enoch, Slavonic Enoch), and issues with this book.
W. R. Morfill’s translation from the Slavonic, edited with introduction, notes, and indices by R. H. Charles, The Book of the Secrets of Enoch (Oxford: Clarendon Press, 1896). Public domain in the United States. Morfill died in 1909 and Charles died in 1931, so the book is in the public domain in the United Kingdom. The verses are transcribed from the Internet Archive scan bookofsecretsofe00morf. Charles’s footnotes, exegetical notes, and bracketed section headings are left out. Charles prints the longer A text and gives B and Sokolov’s manuscript in his notes. Square brackets inside verses are his.