'One's' in the Bible

the true character of each individual's work will become manifest. For the day of Christ will disclose it, because that day is soon to come upon us clothed in fire, and as for the quality of every one's work-- the fire is the thing which will test it.

If any one's work--the building which he has erected--stands the test, he will be rewarded.

If any one's work is burnt up, he will suffer the loss of it; yet he will himself be rescued, but only, as it were, by passing through the fire.