Where does “истьць” come from?

истьць (Old Church Slavonic) comes from Proto-Slavic jьstьcь.

Ancestry of “истьць”, step by step

StepLanguageWordMeaning
1Proto-Slavicjьstьcь

Words derived from “истьць

Every word from Proto-Slavic jьstьcь
истьць — Etymology, Origin & Word History | Etymology Explorer