Or HaChaim on Deuteronomy 4:36/אור החיים על דברים ד׳:ל״ו

1 מן השמים השמיעך את קולו ליסרך, "He made you hear His voice out of the heaven in order to discipline you, etc." The meaning of this verse is similar to what I have explained on Exodus 20,1. I have already referred to it on verse 12 in our chapter where Moses underlined that the people did not see a visual, image during the revelation at Mount Sinai. We mentioned that the people heard the first two of the Ten Commandments directly from G'd. This is what Moses meant when he said: "out of the heaven, etc." The meaning of the word ליסרך is "in order to remove the residual pollutants from you;" we have explained this concept already repeatedly. When Moses said ועל הארץ הראך את אשו, "He showed you His fire on the earth," he referred to the manner in which the Israelites heard the other eight of the Ten Commandments. He alluded to the people "seeing" those sounds in the form of fiery flames which had been "hewn" from G'd's words. I have explained already that Exodus 20,15 referred to this phenomenon with the verse: "and the whole nation observed the sounds, etc." Moses elaborated on this once more in verse 12 of our chapter which mentioned the absence of a visual image for the people to see at that time.

2The words: "and you have heard His words out of the fire" are most appropriate as they refer to the last eight of the Ten Commandments, the "fire" referring to the angel which materialised and asked each individual Israelite if he accepted the commandment in question.