Adam Clarke's Commentary on the Bible - Exodus 19:22
Let the priests also - sanctify themselves - That there were priests among the Hebrews before the consecration of Aaron and his sons, cannot be doubted; though their functions might be in a considerable measure suspended while under persecution in Egypt, yet the persons existed whose right and duty it was to offer sacrifices to God. Moses requested liberty from Pharaoh to go into the wilderness to sacrifice; and had there not been among the people both sacrifices and priests, the request... read more
Adam Clarke's Commentary on the Bible - Exodus 19:20
The Lord came down - This was undoubtedly done in a visible manner, that the people might witness the awful appearance. We may suppose that every thing was arranged thus: the glory of the Lord occupied the top of the mountain, and near to this Moses was permitted to approach. Aaron and the seventy elders were permitted to advance some way up the mountain, while the people were only permitted to come up to its base. Moses, as the lawgiver, was to receive the statutes and judgments from God's... read more