Parallel
Revelation 20:1
Robinson-Pierpont Byzantine Textform · Berean Standard Bible
Καὶ εἶδον ἄγγελον καταβαίνοντα ἐκ τοῦ οὐρανοῦ, ἔχοντα τὴν κλεῖν τῆς ἀβύσσου, καὶ ἅλυσιν μεγάλην ἐπὶ τὴν χεῖρα αὐτοῦ.
Then I saw an angel coming down from heaven with the key to the Abyss, holding in his hand a great chain.