Strong’s Greek
G49 — hagnismos
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
ἁγνισμός
hagnismos — pronounced hag-nis-mos'
from 48; a cleansing (the act), i.e. (ceremonially) lustration:--purification. see GREEK for 48
1 occurrence in the KJV.
Acts 21:26
Then Paul took the men, and the next day purifying himself with them entered into the temple, to signify the accomplishment of the days of purification, until that an offering should be offered for every one of them.