Parallel
Hebrews 12:19
Nestle 1904 Greek New Testament · Berean Standard Bible
καὶ σάλπιγγος ἤχῳ καὶ φωνῇ ῥημάτων ἧς οἱ ἀκούσαντες παρῃτήσαντο μὴ προστεθῆναι αὐτοῖς λόγον
to a trumpet blast or to a voice that made its hearers beg that no further word be spoken.