By which also you are saved, if you keep in memory what I preached unto you, unless you have believed in vain.
All Commentaries on 1 Corinthians 15:2 Go To 1 Corinthians 15
John Chrysostom
AD 407
The Corinthians did not need to learn the doctrine, which they already knew, but they had to be reminded of it and corrected from their errors in understanding it.