Book of Jubilees 6:18
And this whole festival was celebrated in heaven from the day of creation till the days of Noah -twenty-six jubilees and five weeks of years [1309-1659 A.M.]: and Noah and his sons observed it for seven jubilees and one week of years, till the day of Noah's death, and from the day of Noah's death his sons did away with (it) until the days of Abraham, and they eat blood.
Background and history of Book of Jubilees, and issues with this book.
R. H. Charles, The Book of Jubilees, in The Apocrypha and Pseudepigrapha of the Old Testament, vol. 2 (Oxford: Clarendon Press, 1913). Public domain in the United States (published 1913). Charles died in 1931, so the book is in the public domain in the United Kingdom. The verse text is the Joshua Williams transcription at pseudepigrapha.com. Jubilees 1:8 and 1:9 are divided at the break in the 1902 Clarendon scan (archive.org bookofjubileesor00char), where verse 9 begins “For they will forget.” That scan also numbers the angel-of-the-presence sentence as 1:29. Editorial brackets in the translation are Charles’s.