Oecumenius : "For they could not bear what was commanded." He stated the reason for the excuse, because they could not bear what was being defined, that is, what was being commanded or said. Indeed, they said to Moses: "Speak to us, and let not God speak to us." (Ex. 20:19) "Even if a beast touched the mountain." Such was the terror that if the beast touched the mountain, it was stoned. — The Pseudo-Oecumenian Catena on Hebrews