gospel

1. The first section of the Christian New Testament scripture, comprising the books of Matthew, Mark, Luke and John, concerned with the life, crucifixion, death, resurrection, and teachings of Jesus.
2. An account of the life, crucifixion, death, resurrection, and teachings of Jesus, generally written during the first several centuries of the Common Era.
3. The teaching of Divine grace as distinguished from the Law or Divine commandments.
4. A message expected to have positive reception or effect, one promoted as offering important (or even infalliable) guiding principles.
5. That which is absolutely authoritative (definitive).
6. Gospel music.

verb

To instruct in the gospel.