Where does “рассказа́ть” come from?
рассказа́ть (Russian) comes from Russian сказа́ть, from Russian каза́ть, from Proto-Slavic kāzàti, from Proto-Indo-European kʷeǵ-, from Proto-Indo-European kʷeḱ- — to see; to look.
Ancestry of “рассказа́ть”, step by step