On verse 6: Did you notice that the gift of myrrh is missing? In the first coming of Jesus, the Wise Men from the East brought Gold, frankincense and myrrh, but here at the second coming myrrh is omitted. Jesus sacrifice for our sins was done once for all here on earth.
On verse 7: It is clear that the descendants of Kedar and Nebaiotha settled not too far from Jerusalem, since they provided sheep and rams for the daily sacrifice. They most likely settled in the very northern Levant.
This promise is repeated in Revelation 21:22 And I saw no temple therein: for the Lord God Almighty and the Lamb are the temple of it. 23 And the city had no need of the sun, neither of the moon, to shine in it: for the glory of God did lighten it, and the Lamb is the light thereof. 24 And the nations of them which are saved shall walk in the light of it: and the kings of the earth do bring their glory and honour into it. 25 And the gates of it shall not be shut at all by day: for there shall be no night there. 26 And they shall bring the glory and honour of the nations into it. 27 And there shall in no wise enter into it any thing that defileth, neither whatsoever worketh abomination, or maketh a lie: but they which are written in the Lamb’s book of life.
There may be more famous renditions of this song, but this one moved me.