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Acts 12:9
Robinson-Pierpont Byzantine Textform · Berean Standard Bible
Καὶ ἐξελθὼν ἠκολούθει αὐτῷ· καὶ οὐκ ᾔδει ὅτι ἀληθές ἐστιν τὸ γινόμενον διὰ τοῦ ἀγγέλου, ἐδόκει δὲ ὅραμα βλέπειν.
So Peter followed him out, but he was unaware that what the angel was doing was real. He thought he was only seeing a vision.