Jamieson, Fausset and Brown on Jeremiah 40:5

5. while he was not yet gone back--parenthetical. When Jeremiah hesitated whether it would be best for him to go, Nebuzara-dan proceeded to say, "Go, then, to Gedaliah," (not as English Version, "Go back, also"), if thou preferrest (as Nebuzara-dan inferred from Jeremiah's hesitancy) to stop here rather than go with me.

victuals--(Is 33:16).

reward--rather, "a present." This must have been a seasonable relief to the prophet, who probably lost his all in the siege.