NET
13 each builder’s work will be plainly seen, for the Day will make it clear, because it will be revealed by fire. And the fire will test what kind of work each has done.
Darby
13 the work of each shall be made manifest; for the day shall declare [it], because it is revealed in fire; and the fire shall try the work of each what it is.
KJV
13 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.