Strong’s Greek
G4520 — sabbatismos
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
σαββατισμός
sabbatismos — pronounced sab-bat-is-mos'
from a derivative of 4521; a "sabbatism", i.e. (figuratively) the repose of Christianity (as a type of heaven):--rest. see GREEK for 4521
1 occurrence in the KJV.
Hebrews 4:9
There remaineth therefore a rest to the people of God.