Where does “обѣщати” come from?

обѣщати (Old East Slavic) comes from Old Church Slavonic обѣщать, from Proto-Slavic oběťati, from Proto-Slavic věťati, from Proto-Balto-Slavic waitjāˀtei.

Ancestry of “обѣщати”, step by step

StepLanguageWordMeaning
1Old Church Slavonicобѣщать
2Proto-Slavicoběťatito promise, to pledge
3Proto-Slavicvěťatito say, to make a claim, to converse
4Proto-Balto-Slavicwaitjāˀtei

Words derived from “обѣщати

Every word from Proto-Balto-Slavic waitjāˀteiEvery word from Proto-Slavic věťatiEvery word from Proto-Slavic oběťati