that the mountain
A mountain, in Scripture symbolism, means a kingdom Daniel 2:35; Revelation 13:1; Revelation 17:9-11.

Day of the Lord (Day of Jehovah) vs.
Isaiah 2:10-22; Isaiah 4:1-6 ; Isaiah 11:10-13; Isaiah 13:9-16 ; Isaiah 24:21-23; Isaiah 26:20; Isaiah 26:21; Isaiah 63:1-6; Isaiah 66:15-24; Jeremiah 25:29-33; Jeremiah 46:10; Ezekiel 30:3; Revelation 19:11-21