1 Corinthians 15:1-2
Moreover, brethren, I declare to you the gospel which I preached to you, which also you received and in which you stand,
2by which also you are saved, if you hold fast that word which I preached to you—unless you believed in vain.
1 Corinthians 15:12:-17
Now if Christ is proclaimed as raised from the dead, how can some of you say that there is no resurrection of the dead?
13But if there is no resurrection of the dead, then not even Christ has been raised.
14And if Christ has not been raised, then our preaching is in vain and your faith is in vain.
15We are even found to be misrepresenting God, because we testified about God that he raised Christ, whom he did not raise if it is true that the dead are not raised.
16For if the dead are not raised, not even Christ has been raised.
17And if Christ has not been raised, your faith is futile and you are still in your sins.
So.... some members of the church at Corinth denied the resurrection. These are those who are being addressed in in the first 2 verses of chapter 15.
What kind of Christian denies the resurrection?