G2789–κιθαρίζω–kitharizō

Even lifeless things giving a sound, whether pipe or harp, if they give not distinction to the sounds, how shall it be known what is piped or harped?

κιθαριζόμενον; kitharizomenon “is being harped?”

And I heard a voice out of the heaven as a voice of many waters, and as a voice of great thunder. And the voice which I heard [ergänzt: was] as of harp-singers harping with their harps;

κιθαριζόντων kitharizontōn “harping”