Reading Isaiah 4 and 5

Chapter 4 continues as Chapter 3 ended, with a warning to the women of Jerusalem.

It then goes on to talk about 'The Branch of the LORD'

"In that day the Branch of the LORD will be beautiful and glorious, and the fruit of the land will be the pride and glory of the survivors in Israel." v.2

The Branch of the LORD must be Jesus. It's a great picture...one picked up by Jesus in John 15:1-8, although in that case he refers to himself as the vine and believers as the fruit.
"No branch can bear fruit by itself; it must remain in the vine." John 15:4

[This is from http://www.enduringword.com/commentaries/2304.htm
This image is repeated in Isaiah 11:1: There shall come forth a Rod from the stem of Jesse, and a Branch shall grow out of his roots. It is repeated in Jeremiah 23:5: “Behold, the days are coming,” says the Lord, “That I will raise to David a Branch of righteousness; a King shall reign and prosper, and execute judgment and righteousness in the earth.” It is repeated in Jeremiah 33:15: In those days and at that time I will cause to grow up to David a Branch of righteousness; He shall execute judgment and righteousness in the earth. It is repeated in Zechariah 3:8: For behold, I am bringing forth My Servant the branch.]


"...wash away the filth...cleanse the bloodstains from Jerusalem by a spirit of judgement and a spirit of fire." v.4

The NIV gives an alternative to 'spirit' of 'The Spirit' .

And he continues.. (i'm going to quote all of it because it's so beautiful)

"Then the LORD will create over all of Mount Zion and over those who assemble there a cloud of smoke by day and a glow of flaming fire by night; over all the glory will be canopy. It will be a shelter and shade from the heat of the day, and a refuge and hiding-place from the storm and rain." v.5-6

It's interesting how the cloud of smoke and the flaming fire are how God manifested himself in leading the Israelites in the desert. Essentially he seems to be saying that God himself will be over the whole assembly. It seems more likely this is the Spirit. Was the cloud and fire in the desert also the Spirit? ..seems to make sense!
http://www.enduringword.com/commentaries/2304.htm explains that it means simply that when 'the Branch of the Lord' reigns God will be manifest as clearly as He was in the desert.