Jeremiah 35:13 - Ellicott's Commentary On The Whole Bible

Will ye not receive instruction... — The argument of the prophet is naturally an à fortiori one. The words of Jonadab had been kept faithfully as a rule of life for 300 years by his descendants or his order. The words of Jehovah, “rising early and speaking” through His prophets (we note the repetition of the characteristic phrase of Jeremiah 7:13; Jeremiah 25:3), were neglected by the people whom He had adopted as His children. They, too, had the same promise that by obeying they should dwell in the land which He had given them, but they had turned a deaf ear both to the promise and the warning which it implied.