The Apostle Paul
Romans 14:11BSB·traditional attribution

It is written: “As surely as I live, says the Lord, every knee will bow before Me; every tongue will confess to God.”

John Calvin Reformed @genevareformer

11. As I live, etc. He seems to me to have quoted this testimony of the Prophet, not so much to prove what he had said of the judgment-seat of Christ, which was not doubted among Christians, as to show that judgment ought to be looked for by all with the greatest humility and lowliness of mind; and this is what the words import.

Matthew Henry Presbyterian @wholebiblehenry

We have in this chapter, I. An account of the unhappy contention which had broken out in the Christian church. Our Master had foretold that offences would come; and, it seems, so they did, for want of that wisdom and love which would have prevented discord, and kept up union among them. 1.

Commenting on Romans 14:1-23

John Gill Reformed Baptist @doctorgill

For it is written,.... In Isa 45:23; though Justin Martyr (o) cites a like passage with what follows, as out of Ezekiel 37, but no such words appear there, either in the Hebrew text, or Septuagint version: as I live, saith the Lord; the form of an oath used often by the Lord; who because he could swear by no greater, he swore by himself...