3 John 1:5

5 Beloved, thou doest faithfully whatsoever thou doest to the brethren, and to strangers;

Commentaries

Oecumeniuson 3 John 1:5AD 550

Dearly beloved, you faithfully do whatever you work for the brothers and for the guests, who have borne witness to your love in the sight of the Church; if you have led them to God worthily, you will benefit. For they went forth for His name, taking nothing from the Gentiles.
"you faithfully do," this is what befits a faithful man.

Source: Commentary on 3 John

Bedeon 3 John 1:5AD 735

Beloved, you act faithfully in whatever you work for the brethren, etc. You act faithfully, he says, as if he said: Just as you are truly faithful, so you act, showing your faith by your works.

Source: Commentary on the Catholic Epistles