1 Corinthians 15:1

Moreover, brethren, I declare unto you the gospel which I preached unto you, which also ye have received, and wherein ye stand;

Christ's resurrection rests on many eye-witnesses, including Paul, and is the great fact preached as the groundwork of the Gospel. They who deny resurrection in general must deny that of Christ; and the consequence will be that Christian preaching and faith are vain.

I declare - literally, 'I make known.' It implies some reproach that it should be now necessary to make it known to them afresh, owing to some 'not having the knowledge of God' (: cf. ).

Wherein ye stand - ye now take your stand. Your present high standing, if ye suffer not yourselves to fall from it.