2 Kings 10:15, 23

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 Jehu went, and Jehonadab the son of Rechab, into the house of Baal; and he said unto the worshippers of Baal, Search, and look that there be here with you none of the servants of Jehovah, but the worshippers of Baal only.