John Gill Bible Commentary

Thus saith the Lord of hosts, the God of Israel,.... The Lord of armies in heaven and earth; the Creator of Israel; their benefactor, covenant God and Father and whom they professed to worship; God and not man; infinitely greater than Jonadab, whose precepts had been observed by his posterity: go and tell the men of Judah, and the inhabitants of Jerusalem; this is an order to the prophet to remove from the chamber where he was with the Rechabites, and go to the court of the people, where they were assembled for worship; or into the city of Jerusalem, and gather the heads of them together, and declare the following things to them: will ye not receive instruction to hearken to my words? saith the Lord; from this instance and case of the Rechabites, who had so constantly obeyed their father, and hearkened to his words, though but a man; a father of their flesh; an earthly father; and who had been dead long ago; and therefore much more ought they to hearken to the Father of their spirits; their Father which is in heaven, and who lives for ever.