Paul begins 1 Corinthians 15 by focusing on the gospel. He speaks about the gospel: (1) which he preached to the Corinthians; (2) which they received; (3) in which they stood; and (4) by which they were saved (1 Cor. 15:1, 2, NKJV). This opening prepares the reader for what comes next in the chapter and shows how essential Christ’s resurrection is for our salvation (see also Rom. 10:9, 10). His resurrection is such a vital part of the gospel message that denying it contradicts one’s faith in Christ.