Revelation of Jesus Christ
From the KJV 1611 with Strong's Concordance
G4102
πίστις
pistis
{pis'-tis}
From G3982; persuasion, that is, credence; moral conviction (of religious truth, or the truthfulness of God or a religious teacher), especially reliance upon Christ for salvation; abstractly constancy in such profession; by extention the system of religious (Gospel) truth itself.
NOTE: Used widely throughout the New Testament (below are the usages from Revelation only).
faith
Revelation 2:13, 19 13:10; 14:12.