Where does “алфави́т” come from?

алфави́т (Russian) comes from Byzantine Greek ἀλφάβητον, from Ancient Greek ἀλφάβητος, from Ancient Greek ἄλφα, from Phoenician 𐤀𐤋𐤐, from Proto-Semitic *ʔalp- — thousand.

алфави́т (Russian): alphabet