Where does “паніхіда” come from?

паніхіда (Belarusian) comes from Ancient Greek παννυχίδα, from Ancient Greek Παννυχίς, from Ancient Greek Νύξ, from Ancient Greek νύξ, from Proto-Indo-European nókʷts, from Proto-Indo-European negʷ- — bare, naked.

паніхіда (Belarusian): funeral service