The gospel of God and the gospel of Christ.

1 Pet 4:17-18
For the time is come
that judgment must begin at the house of God:
and if it first begin at us,
what shall the end be of them that obey not the gospel of God?

In the day when God shall judge the secrets of men by Jesus Christ according to my gospel. (Rom. 2:16)

But I certify you brethren, that the gospel which was preached of me is not after man. For I neither received it of man, neither was I taught it, but by the revelation from Jesus Christ. (Gal. 1:11,12)

But if our gospel be hid, it is hid to them that are lost: Cor 4:3