The term gospel is traditionally used in Christianity to mean the news of Jesus's sacrifice for mankind.

--Matthew 4--(23)And Jesus went about all Galilee, teaching in their synagogues, and preaching the gospel of the kingdom, and healing all manner of sickness and all manner of disease among the people.

--Mark 16--(15)And he said unto them, Go ye into all the world, and preach the gospel to every creature.