Genesis 25:1 Then again Abraham took a wife, and her name was Keturah. Nave's Topical Index
Library
The Book of Jubilees ... in 1979; Isaac is born on the same festival in the following year; he marries Rebecca in the same year that his father married Keturah; Abraham before he dies ... //christianbookshelf.org/deane/pseudepigrapha/the book of jubilees.htm
