From the early Church Fathers to now.
“And thou shalt appoint certain limits to the people round about, and thou shalt say to them: Take heed you go not up into the mount, and that ye touch not the borders thereof: every one that toucheth the mount dying he shall die.”
“In this wonderful agreement there is the very great difference, that in the Old Testament the people is held back by a fearful dread from approaching the place where the law was given; whereas in the New the Holy Spirit comes upon those who were assembled together waiting for his promised coming.”
The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.