Jeremiah 29:25-26

This man had sent letters in his own name, not in Yahweh’s name, to Zephaniah ben Maaseiah the priest, the other priests, and the people in Jerusalem. He had told them that the Lord wanted Zephaniah to be the priest in charge of order in the temple instead of Jehoiada, the authorized priest. [Note: Zephaniah ben Maaseiah consulted Jeremiah twice for King Zedekiah (Jeremiah 21:1; Jeremiah 37:3). He was then or later became the priest who was second in command in the temple (Jeremiah 52:24). He went into captivity in 586 B.C. and suffered execution in Babylon (Jeremiah 52:24-27; 2 Kings 25:18-21). Jehoiada had evidently replaced Pashhur, who may have been taken to Babylon as an exile (cf. Jeremiah 20:1-6).] Zephaniah was to put any "mad man" who prophesied in the Lord’s name in the stocks and his neck in an iron collar (cf. Jeremiah 20:1-3). The Hebrew word translated "iron collar" occurs only here in the Old Testament. Its meaning is somewhat obscure, though it probably describes some type of restraining device.

"The irony is that Zephaniah would, according to Deuteronomy 28:34, become a madman himself when he witnessed the judgment coming upon Jerusalem." [Note: Scalise, p. 79.]