when. holy solemnity is kept. Reference to Pentateuch. and the habitual keeping of the feasts there prescribed (Leviticus 23:2, &c). See App-92.
holy. See note on Exodus 3:6.
the mountain of the LORD. See notes on Isaiah 2:3, and Ezekiel 28:16.
mighty One. Rock. Reference to Pentateuch (Deuteronomy 32:4; Deuteronomy 32:15; Deuteronomy 32:18; Deuteronomy 32:30; Deuteronomy 32:31). Compare Isaiah 26:4. App-92.