Rev., correctly, signs. See on Mat 11:20; see on Mat 24:24. This act was not merely a prodigy (τέρας), nor a wonderful thing (θαυμάσιον), nor a power (δύναμις), but distinctively a sign, a mark of the doer's power and grace, and divine character. Hence it falls in perfectly with the words manifested His glory.
Believed on Him (ἐπίστευσαν εἰς αὐτὸν)
See on Joh 1:12. Literally, believed into. Canon Westcott most aptly says that it conveys the idea of “the absolute transference of trust from one's self to another.”