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

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

Now in the morning he went out and stood and said to all the people, “You are innocent; behold, I conspired against my master and killed him, but who killed all these? Know then 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 spoke through His servant Elijah.”

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