John Gill Commentary Jeremiah 35:16

"Forasmuch as the sons of Jonadab the son of Rechab have performed the commandment of their father which he commanded them, but this people hath not hearkened unto me;" — Jeremiah 35:16 (ASV)

Because the son of Jonadab the son of Rechab Here we have the contrast between the Rechabites and the Israelites; the obedience of the one, and the disobedience of the other; the design of which is to aggravate and expose the sin of the Jews, since the former have performed the commandment of their father, which he commanded them; that particular commandment of not drinking wine, which they had never once violated in such a course of time; nor could they now be prevailed upon, even by the prophet himself, to do it: but this people has not listened to me; the Lord their God, their father that bought them, made them, and established them. Gross ingratitude! (Deuteronomy 32:6).