2 Chronicles 21:3-4

3Their father had given them many gifts of silver, gold and other valuable things. He gave them authority over the strong cities of Judah. But Jehoshaphat chose Jehoram be the next king because he was his oldest son.

4Jehoram made himself a strong king to rule over his father's kingdom. Then he killed all his brothers, as well as some of the Israelite leaders.