John Gill Commentary Luke 23:47

"And when the centurion saw what was done, he glorified God, saying, Certainly this was a righteous man." — Luke 23:47 (ASV)

Now when the centurion saw what was done: The eclipse of the sun, the darkness upon the land, the earthquake, the rocks rent, and Jesus expire in so uncommon a manner.

he glorified God: by confessing that Christ was the Son of God, and declaring him an innocent person.

saying, certainly, this was a righteous man: clear of the charges exhibited against him, and has suffered wrongfully; and this he concluded from those unusual appearances, and which he considered as tokens of divine resentment.