Book of Jubilees 4:7
And Adam and his wife mourned for Abel four weeks of years, [99-127 A.M] and in the fourth year of the fifth week [130 A.M.] they became joyful, and Adam knew his wife again, and she bare him a son, and he called his name Seth; for he said 'GOD has raised up a second seed unto us on the earth instead of Abel; for Cain slew him.'
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.