Where does “салям алейкум” come from?

салям алейкум (Russian) comes from Arabic السَّلَام عَلَيْكُم.

салям алейкум (Russian): salaam alaikum

Definitions

Step	Language	Word	Meaning
1	Arabic	السَّلَام عَلَيْكُم	—

салям алейкум — Etymology, Origin & Word History | Etymology Explorer