Where does “шариат” come from?

шариат (Russian) comes from Classical Persian شَرِیعَت, from Arabic شَرِيعَة.

шариат (Russian): shari'a

Definitions

Step	Language	Word	Meaning
1	Classical Persian	شَرِیعَت	—
2	Arabic	شَرِيعَة	—

шариат — Etymology, Origin & Word History | Etymology Explorer