Cross reference
1 Corinthians 15:11
11 If then it is I who am the preacher, or they, this is our word, and to this you have given your faith.
1 Corinthians 2:2
2 For I had made the decision to have knowledge of nothing among you but only of Jesus Christ on the cross.
1 Corinthians 15:3-4
3 For I gave to you first of all what was handed down to me, how Christ underwent death for our sins, as it says in the Writings;
4 And he was put in the place of the dead; and on the third day he came back from the dead, as it says in the Writings;