Book of Jubilees 38:8
And Simeon and Benjamin and Enoch, Reuben's son, went forth on the west side of the tower, and fifty (men) with them, and they slew of Edom and of the Horites four hundred men, stout warriors; and six hundred fled, and four of the sons of Esau fled with them, and left their father lying slain, as he had fallen on the hill which is in 'Aduram.
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.