The first four books of the New Testament are commonly referred to as the four Gospels. Essentially the word Gospel means good news and it is not only used in the sense of the good news of Jesus Christ, but the Gospel is also used to delineate the message of salvation in Christ.
“Now the word of the Lord came to Jonah the son of Amittai, saying, ‘Arise, go to Nineveh, that great city, and cry out against it; for their wickedness has come up before Me’” Jonah 1:1-2.