They were scorched by the intense heat, and they cursed the name of God, who had authority over these plagues, and they did not repent and give him glory.
In context
7And I heard the altar say, “Yes, Lord God, the Almighty, true and just are your judgments.” 8The fourth angel poured out his bowl on the sun, and it was allowed to scorch people with fire. 9They were scorched by the intense heat, and they cursed the name of God, who had authority over these plagues, and they did not repent and give him glory. 10The fifth angel poured out his bowl on the throne of the beast, and its kingdom was plunged into darkness. People gnawed their tongues in anguish 11and cursed the God of heaven because of their pain and their sores, and did not repent of their deeds.