Gospel (noun)

1. The message of the Christian faith, particularly as presented in the New Testament of the Bible.
2. Any of the four books of the New Testament (Matthew, Mark, Luke, and John) that tell the story of Jesus Christ's life and teachings.
3. A set of beliefs or principles that one considers to be of great importance or sacred.

Origin:

From old english godspel "good news, glad tidings", from god "good" + spel "news, message".

Examples:

1. He preached the gospel to the congregation.
2. The gospel of Luke is one of the four gospels in the New Testament.
3. She lived her life according to the gospel of peace.
4. The gospel according to Matthew is one of the four gospels in the New Testament.
5. He is spreading the gospel of this new ideology.