ויהי בנסע הארן ויאמר משה (בהעלותך י:לה)

There is a halacha that if G-d forbid a Sefer Torah is burning on Shabbos, one is allowed to save it even if there isn’t an eiruv in the city, and even if letters are erased, and it only contains eighty-five letters, like the number of words in the parsha of ויהי בנסע.

The Baal HaTurim adds that this is why, following the words ויהי בנסע, it says ותבער בם אש ה ‘ – to state that one is allowed to save such a Torah from fire.