John Gill's Exposition of the Whole Bible
Jeremiah 40:13
Moreover, Johanan the son of Kareah,.... Who seems to be the principal captain next to Ishmael, against whom an information is brought, and so not present; this captain is here only mentioned by name, and before next to Ishmael:
and all the captains of the forces that [were] in the fields; or that had been in the fields, and probably might be there again; see
Jeremiah 40:7; that is, the rest of them, besides Johanan mentioned, and Ishmael the conspirator: these
came to Gedaliah to Mizpah; they had been with him before, and being satisfied by him of the safety they would be in, in the service of the Chaldeans, under him, either returned to the fields from whence they came, or went to those cities and villages he directed them to; but, like honest and faithful men, knowing there was a conspiracy against his life, came in a body to inform him of it, for the greater certainty of it; as judging he would be more ready to give heed unto it, than if only a single person had informed him of it, as well as to show their affection and loyalty to him.