Proto-Slavic *posъlъ

→ Belarusian пасол (inherited)

→ Czech posel (inherited)

→ Lower Sorbian pósoł (inherited)

→ Polish poseł (inherited)

→ Russian посол (inherited)

→ Serbo-Croatian posao (inherited)

→ Serbo-Croatian посао (inherited)

→ Slovak posol (inherited)

→ Slovene posel (inherited)

→ Albanian pusullë (borrowed)

→ Ukrainian посол (inherited)