The Gospel  - 1st Corinthians 15:1 - 4

Romans 16:25 Now to him that is of power to stablish you according to my gospel, and the preaching of Jesus Christ, according to the revelation of the mystery, which was kept secret since the world began,

For the preaching of the cross is to them that perish foolishness;

but unto us which are saved it is the power of God. 1Corinthians 1:18

left click on the cross preacher for a welcome introduction