And it shall come to pass in the last days, that the mountain of the LORD's house shall be established in the top of the mountains, and shall be exalted above the hills; and all nations shall flow unto it.
In the last days - i:e., Messiah's; especially the days yet to come, to which all prophecy hastens, when "the house of the God of Jacob," namely, at Jerusalem, shall be the center to which the converted nations shall flock together (Ezekiel 17:23; Luke 2:31-32; Acts 1:6-7), where 'the kingdom' of Israel is regarded as certain, and the time alone uncertain (Psalms 68:15-16; Psalms 72:8; Psalms 72:11). Same as Micah 4:1. Since the passage in Micah is more connected with the preceding context than it is here, Isaiah seems to have drawn it from Micah, not vice versa.
The mountain of the Lord's house shall be established in the top of the mountains - the temple on Mount Moriah: type of the Gospel, beginning at Jerusalem, and, like an object set on the highest hill, made so conspicuous that all nations are attracted to it.
All nations shall flow unto it - as a broad stream (Isaiah 66:12).