Acts 9:7

7οἱAndδὲthe menἄνδρεςοἱtraveling withσυνοδεύοντεςhimαὐτῷstoodεἱστήκεισανspeechlessἐνεοί,hearingἀκούοντεςindeedμὲνtheτῆςvoiceφωνῆςno oneμηδέναhoweverδὲseeingθεωροῦντες.

And the men traveling with him stood speechless, hearing the voice indeed, but seeing no one.