Where does “горѣти” come from?
горѣти (Old Church Slavonic) comes from Proto-Slavic gorěti, from Proto-Balto-Slavic garḗˀtei, from Proto-Indo-European gʷʰer-, from Proto-Indo-European gʷʰe-gʷʰór-e ~ gʷʰe-gʷʰr-ḗr.
горѣти (Old Church Slavonic): to burn
Ancestry of “горѣти”, step by step