John the Apostle
Revelation 13:12BSB·traditional attribution

And this beast exercised all the authority of the first beast and caused the earth and those who dwell in it to worship the first beast, whose mortal wound had been healed.

Matthew Henry Presbyterian @wholebiblehenry

Those who think the first beast signifies Rome pagan by this second beast would understand Rome papal, which promotes idolatry and tyranny, but in a more soft and lamb-like manner: those that understand the first beast of the secular power of the papacy take the second to intend its spiritual and ecclesiastical powers, which act under the disguise of religion and charity to the souls of men. Here observe, I.

Commenting on Revelation 13:11-18

John Gill Reformed Baptist @doctorgill

And he doeth great wonders,.... Or miracles; not real, but pretended ones, lying wonders, which the Popish legends are full of the accounts of, as done by the priests, or by this or the other saint: so that he maketh fire come down from heaven on the earth in the sight of men; in imitation of Elijah, Kg2 1:9; and this single instance is put...

Albert Barnes Presbyterian @notesbybarnes

Verse 12. And he exerciseth all the power of the first beast before him. The same amount of power; the same kind of power. This shows a remarkable relationship between these two beasts; and proves that it was intended to refer to the same power substantially, though manifested in a different form.