The gospel is the good news of salvation through Christ Jesus. These “glad tidings of great joy“ were announced on the first Christmas day, in the birth of “a Savior who is Christ our Lord.” A savior who took the punishment for our sins, punishment that we deserved, and then rose from the dead offering us the free gift of life, if only we would accept that gift.
Check out our study of 2 Timothy 1:8-10 here.