Ancient Macedonian language – Wikipedia
… the recent epigraphic discoveries in the Greek region of Macedonia, such as the Pella curse tablet, suggest that ancient Macedonian might have been a variety of the North Western Ancient Greek dialects.
You may not have heard of NW Greek, the dialect of Epirus and Western Central Greece. You will have heard of the closely related Doric (which some authorities subsume in NW Greek, and some authorities vice versa). In fact, the text of the Pella curse tablet is, to my relatively untrained eyes, straight Doric.