en_tn/num/26/61.md

they offered before Yahweh unacceptable fire

Here the word "fire" is used to refer to "burning incense." See how you translated a similar phrase in Numbers 3:4. Alternate translation: "they burned an incense offering to Yahweh in a way that he did not approve of" (See: rc://en/ta/man/jit/figs-metonymy)