Jeremiah 6:16,17 - Joseph Benson’s Commentary on the Old and New Testaments

Stand ye in the ways, &c. He now turns his speech to the people, and gives them counsel; by a metaphor taken from travellers, who, being in doubt of their way, stand still, and consider, whether the direction, which they have received from some false guide, be right or not. Ask for the old paths Inquire in what way the patriarchs, the judges, the kings, and prophets of former times walked, and imitate their practices. And ye shall find rest for your souls You will find peace with God, will be safe under his protection, and in consequence thereof will have comfort and satisfaction in your own minds. See Matthew 11:28-29. But they said, We will not walk therein If they did not say so in express words, yet such was the language of their actions: though the prophets had directed them into the right way, and though they knew others had experienced it to be so, yet they would not be persuaded to walk in it, but deliberately refused the blessings offered them. Also I set watchmen over you I gave you prophets, as so many watchmen, to warn you of the evils that threatened you. And they faithfully discharged their duty, admonishing you of your sins, and giving you faithful warning of the judgments they would bring upon you; saying, Hearken to the sound of the trumpet That is, to the warning given you of approaching danger. It was customary, in those days and countries, to have continually watchmen placed on high towers, or on hills, who observed the country all round, to prevent any sudden hostile invasion, by giving early notice of any appearance thereof by sound of trumpet. “So the prophets, who were the observators of the manners of the people, and who had early notice from God what evils were coming, unless prevented by repentance and amendment of life, are called watchmen.”