2 Chronicles (Author Compiled by Isaiah and Ezra from records of Nathan, Gad, Iddo, Ahijah, Jehu and others.)
Chapter 21
4And Jehoram riseth up over the kingdom of his father, and strengtheneth himself, and slayeth all his brethren with the sword, and also -- of the heads of Israel.
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.