Matthew 5:14 (BSB)

You are the light of the world. A city on a hill cannot be hidden.

From Matthew 5. Also in the ESV.

Commentary on Matthew 5:14

• John Calvin (Reformed), Calvin's Commentaries on Matthew 5:14: Matthew 5:14 Ye are the light of the world We are all the children of light, after having been enlightened by faith, and are commanded to carry in our hands “burning lamps,” (that we may not wander in darkness,) and even to point out to others the way of life, (Luke 12:35.) But, as the preaching of the Gospel was committed to the apostles above...
• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Matthew 5:13-16: Christ had lately called his disciples, and told them that they should be fishers of men; here he tells them further what he designed them to be - the salt of the earth, and lights of the world, that they might be indeed what it was expected they should be. I. Ye are the salt of the earth.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Matthew 5:14: Ye are the light of the world,.... What the luminaries, the sun and moon, are in the heavens, with respect to corporal light, that the apostles were in the world with regard to spiritual light; carrying and spreading the light of the Gospel not only in Judea, but all over the world, which was in great darkness of ignorance and error; and through a divine...
• Albert Barnes (Presbyterian), Barnes' New Testament Notes on Matthew 5:14: Verse 14. The light of the world. The light of the world often denotes the sun, . The sun renders objects visible, shows their form their nature, their beauties, and deformities. The term light is often applied to religious teachers. See . It is pre-eminently applied to Jesus in these places; because he is, in the moral world, what the sun is in the natural world.