1 Cor 3:11-15
"For no one can lay a foundation other than that which is laid, which is Jesus Christ. Now if anyone builds on the foundation with gold, silver, precious stones, wood, hay, straw, each one's work will become manifest, for the Day will disclose it, because it will be revealed by fire, and the fire will test what sort of work each one has done."
The foundation (themelion) is already laid—it is Christ. Upon it, each minister builds. The fire of judgment will test the quality of the work: gold, silver, and precious stones endure; wood, hay, and straw are consumed. The minister may be saved, but 'as through fire'—without reward.