Is 1 Cor. 3:15 talking about the worker being saved or the one being taught?

“If any man’s work is burned up, he will suffer loss; but he himself will be saved, yet so as through fire.” ‭‭1 Corinthians‬ ‭3‬:‭15‬ ‭NASB1995‬‬ I understand that the worker will lose reward if he doesn’t build upon a person’s faith with…