2 Kings 10:6, 9-10, 15-16

Then Jehu wrote a second letter to them, saying, “If you are with me and will obey me, take the heads of your master’s sons, and come to me at Jezreel tomorrow about this time.” Now the [dead] king’s sons, seventy persons, were with the great men of the city, who were rearing them.

The next morning he went out and stood and said to all the people, “You are just and innocent; behold, I conspired against [Joram] my master and killed him, but who killed all these? Know then [without any doubt] that there shall fall to the earth nothing of the word of the LORD, which the LORD spoke concerning the house of Ahab, for the LORD has done what He said through His servant Elijah.” [1 Kin 19:17]

When Jehu went on from there, he met Jehonadab the son of Rechab coming to meet him. He greeted him and said to him, “Is your heart right, as my heart is with yours?” Jehonadab answered, “It is.” Jehu said “If it is, give me your hand.” He gave him his hand, and Jehu pulled him up into the chariot. And he said, “Come with me and see my zeal for the LORD.” So he had Jehonadab in his chariot.