John Gill Commentary Jeremiah 35:18

"And Jeremiah said unto the house of the Rechabites, Thus saith Jehovah of hosts, the God of Israel: Because ye have obeyed the commandment of Jonadab your father, and kept all his precepts, and done according unto all that he commanded you;" — Jeremiah 35:18 (ASV)

And Jeremiah said to the house of the Rechabites To the family of them, to those that were with him in the temple, and while they were there; and what he said to them, which is as follows, was by the order and direction of the Lord:

thus says the Lord of hosts, the God of Israel; he uses the same titles, when speaking to them, as to the Jews, expressive of his sovereignty, power, and grace:

because you have obeyed the commandment of Jonadab your father; that particular command concerning not drinking wine:

and kept all his precepts, and done according to all that he has commanded you; all the rest, as well as that; though they were many, they took notice of them, and observed them; they kept them in their minds and memory, and made them the rule of their actions, and conformed to them in all respects.