13 their work will be shown for what it is, because the Day will bring it to light. It will be revealed with fire, and the fire will test the quality of each person’s work.

Read 1 Corinthians 3:13 Using Other Translations

Every man's work shall be made manifest: for the day shall declare it, because it shall be revealed by fire; and the fire shall try every man's work of what sort it is.
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.
But on the judgment day, fire will reveal what kind of work each builder has done. The fire will show if a person’s work has any value.