Book of Jubilees 11:2
And the sons of Noah began to war on each other, to take captive and to slay each other, and to shed the blood of men on the earth, and to eat blood, and to build strong cities, and walls, and towers, and individuals (began) to exalt themselves above the nation, and to found the beginnings of kingdoms, and to go to war people against people, and nation against nation, and city against city, and all (began) to do evil, and to acquire arms, and to teach their sons war, and they began to capture cities, and to sell male and female slaves.
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.