That line comes from VOY s01 "Jetrel."
JANEWAY: Does Neelix really have metremia, or was that just a pretext for getting us to come to Rinax?
JETREL: It was just a pretext, Captain. You do not have metremia, Neelix. You are not going to die.
I let out a "damn" right there.
I know that this was Voyager really punching hard, a sort of "What if a survivor of Hiroshima got to meet Oppenheimer?" story that came out of nowhere, and no warning.
And it's also the one episode of VOY season 01 I never miss, because it's so different to all the rest of the episodes of this season. Or, for that matter, the rest of the series.
But still, to hear the words that he wasn't going to be written out, and they were going to be stuck with a living, breathing Neelix for practically the entire series ...
*curses in Tuvok*