The Apostle Paul
1 Corinthians 3:13BSB·traditional attribution

his workmanship will be evident, because the Day will bring it to light. It will be revealed with fire, and the fire will prove the quality of each man’s work.

John Calvin Reformed @genevareformer

13. For the day will declare it In the old translation it is the day of the Lord, It is so in two of the old English versions. In Wiclif’s version (1380) the rendering is as follows: For the dai of the Lord schal declare. The Rheims version (1582) reads thus: For the day of our Lord will declare. — Ed.

Matthew Henry Presbyterian @wholebiblehenry

Here the apostle informs us what foundation he had laid at the bottom of all his labours among them - even Jesus Christ, the chief corner-stone, Eph 2:20. Upon this foundation all the faithful ministers of Christ build. Upon this rock all the Christians found their hopes. Those that build their hopes of heaven on any other foundation build upon the sand.

Commenting on 1 Corinthians 3:11-15

John Gill Reformed Baptist @doctorgill

Every man's work shall be made manifest,.... The doctrine he preaches shall be sooner or later made manifest to himself, and to his hearers; who shall see the inconsistency, irregularity, and deformity of such a building; at first so well laid, then piled up with such excellent materials, and at last covered in with such trifling or incoherent stuff: for the day shall declare it...