Book of Jubilees 50:9
Ye shall do no work whatever on the Sabbath day save what ye have prepared for yourselves on the sixth day, so as to eat, and drink, and rest, and keep Sabbath from all work on that day, and to bless the Lord your God, who has given you a day of festival and a holy day: and a day of the holy kingdom for all Israel is this day among their days for ever.
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.