Upon the sun (epi ton hlion). Not ei (into) as in verses Genesis 234 . The fourth trumpet ( Genesis 8:12 ) affected a third of the sun, moon, and stars with a plague of darkness, but here it is a plague of extreme heat. To scorch with fire (kaumatisai en puri). First aorist active infinitive of kaumatizw, late (Plutarch, Epictetus) causative verb (from kauma, heat), in N.T. only here and verse Genesis 9 ; Matthew 13:6 ; Mark 4:6 . The addition of en puri (in fire, with fire) intensifies the picture.