John Trapp on Jeremiah 29:26

Ver. 26. The Lord hath made thee Prieſt inſtead of Jehoiada the Prieſt] That heroical Reformer in the dayes of Joaſh, 2 King. 11. Therefore as he did by Mattan the Baalite, ſo do thou by Jeremiah the Anathothite. But neither was Zephaniah Jehoiada, nor Jeremiah Mattan. Shemaiah himſelf was more like a Baalite, and better deſerved that puniſhment, which ſhortly after alſo befell him, as was foretold, ver. 32. A hot-ſpirited man he was, and a boutefeau: being therefore the more dangerous. He alſo ſeemed to himſelf to be ſo much the more holy, by how much the Prophet whom he ſet againſt, was more famous for his holineſſe.

For every one that is mad] Maniacus, arreptitius, fanaticus: ſo Gods zealous ſervants have alwayes been eſteemed by the mad world, ever beſides it ſelf in point of ſalvation. See 2 King. 9.11. Act. 26.24. Jer. 43.2.

That thou ſhouldeſt put him in priſon] As chap. 20.2.