And when the voice of the trumpet sounded long,.... Not in one continued tone, as before, Exo 19:13, where a different word is used, and when it decreased, and was about to cease, which was to summon the people to attend; but now they were come to the foot of the mount, and this sounding was a preparation to the giving of the law unto them, and was not one continued even tone: but waxed louder and louder; or, "going, and exceeding strong"; or, "strengthening itself exceedingly" (x); it went on to an high pitch, until it was exceeding vehement and strong, and so sonorous as scarce to be bore: Moses spake; what he said is not here recorded; it is highly probable, as has been observed by some, that he uttered those words related of him in Heb 12:21 "I exceedingly fear and quake": such an impression did this loud and strong voice of the trumpet make upon him: and God answered him by a voice; a still and gentle one, in order to encourage and comfort him; and so the Targum of Jonathan paraphrases it,"with a pleasant and audible voice, and with delightful words.'' (x) , Sept. "iens et fortificans se valde", Montanus; "roborans se", Vatablus; "quum pergeret et invalesceret valde", Junius & Tremellius, Piscator.