John Trapp on Jeremiah 1:3

Ver. 3. It came alſo in the dayes of Jehoiachim] Called at firſt Eliachim by his good Father Joſiah, from whom he degenerated, cutting Jeremies roul with a pen-knife and burning it, chap. 36. at which his Fathers heart would have melted, as 2 Chron. 34.27.

Ʋnto the end of the eleventh year of Zedekiah] Jehoahaz and Jehoiachim, are not mentioned becauſe their raign was ſo ſhort, hardly half a year. By this computation it appeareth, that Jeremy prophecyed forty years at leaſt. And the Holy Ghoſt ſetteth a ſpecial mark (as a Reverend Writer hath well obſerved) upon thoſe forty years of his prophecying, Lightfoots Harmony Chron. of old Teſt. Ezek. 4.6. where when the Lord ſummeth up the years that were betwixt the falling away of the ten Tribes and the burning of the Temple, three hundred and ninety in all, and counteth them by the Prophets lying ſo many dayes upon his left-ſide; he bids him to lye forty dayes upon his right-ſide, and bear the iniquity of the houſe of Judah forty dayes, a day for a year. Not to ſignify that it was forty years above three hundred and ninety betwixt the revolt of the ten Tribes and the captivity of Judah (for it was but three hundred and ninety exactly in all) but becauſe he would ſet, and mark out Judah's ſingular iniquity, by a ſingular mark; for that they had forty years ſo pregnant inſtructions and admonitions, by ſo eminent a Prophet: and yet were impenitent to their own deſtruction.

Ʋnto the carrying away of Jeruſalem] He thought (belike) when he prefixed this title, that he ſhould have prophecyed no more, when once Jeruſalem was carried captive; but it proved otherwiſe; for he peophecyed after that in Egypt, chap. 44. yet not forty years alſo after the captivity, as the Jews have fabled: Nor is it ſo certain, that for that prophecy he was ſlain by Pharaoh Ophrae (whom Herodotus calleth Apryes, and ſaith he was a very proud Prince) as ſome have ſtoried.Lib. 2. in fine.