Adam Clarke on 1 Corinthians 15:12

Now if Christ be preached, etc. - Seeing it is true that we have thus preached Christ, and ye have credited this preaching, how say some among you, who have professed to receive this doctrine from us; that there is no resurrection of the dead, though we have shown that his resurrection is the proof and pledge of ours? That there was some false teacher, or teachers, among them, who was endeavoring to incorporate Mosaic rites and ceremonies with the Christian doctrines, and even to blend Sadduceeism with the whole, appears pretty evident. To confute this mongrel Christian, and overturn his bad doctrine, the apostle writes this chapter.