"on the secret top / Of Oreb, or of Sinai"

Line 6-7. Refers to Mount Horeb and Mount Sinai where God was said to have delivered the Ten Commandments to Moses; according to Deuteronomy and Exodus respectively. Mount Horeb's location is unknown. Mount Sinai is situated in the Sinai peninsula of Egypt and rises 7,497 feet above sea level. At the summit there is a mosque and a Greek Orthodox chapel which supposedly contains the Tablets of the Law.