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

Then he wrote a letter the second time to them, saying, If ye be on my side, and if ye will hearken unto my voice, take ye the heads of the men your master’s sons, and come to me to Jezreel by to-morrow this time. Now the king’s sons, being seventy persons, were with the great men of the city, who brought them up.

And it came to pass in the morning, that he went out, and stood, and said to all the people, Ye are righteous: behold, I conspired against my master, and slew him; but who smote all these? Know now that there shall fall unto the earth nothing of the word of Jehovah, which Jehovah spake concerning the house of Ahab: for Jehovah hath done that which he spake by his servant Elijah.

And when he was departed thence, he lighted on Jehonadab the son of Rechab coming to meet him; and he saluted him, and said to him, Is thy heart right, as my heart is with thy heart? And Jehonadab answered, It is. If it be, give me thy hand. And he gave him his hand; and he took him up to him into the chariot. And he said, Come with me, and see my zeal for Jehovah. So they made him ride in his chariot.