“I have made you a tester of metals among my people, that you may know and test their ways.
The Prophet says, that he was set by God as a watchtower, which was also fortified, that he might observe the wickedness of the people. In order to gain more authority for his prophecy, he introduces God as the speaker. He had spoken hitherto in his own person; but now God himself comes forth, and says, I have made thee a citadel.
Here, I. God appeals to all the neighbours, nay, to the whole world, concerning the equity of his proceedings against Judah and Jerusalem (Jer 6:18, Jer 6:19): "Hear, you nations, and know particularly, O congregation of the mighty, the great men of the nations, that take cognizance of the affairs of states about you and make remarks upon them.
Commenting on Jeremiah 6:18-30
I have set thee for a tower,.... Or "in" one (d); in a watch tower, to look about and observe the actions of the people, their sins and transgressions, and reprove them for them; as well as to descry the enemy, and give notice of danger; see Hab 2:1 or, "for a trier"; since the word used comes from one which signifies to "try" metals...