Summary: worship can bring both spiritual and physical deliverance
Isaiah 6:1-4 NIV
v.1 "In the year that King Uzziah died, I saw the Lord,"
King Uzziah is a symbol for pride. When pride died, Isaiah was able to see the Lord. He has been a prophet yet he did not see the Lord before. He prophesied five chapters until now. From here is a different story. We may be prophets or so called servants of God. Yet it takes humbleness and lack of pride to see the Lord.
"...train of his robe filled the temple."
We usually think that the Lord is in his temple. Now the temple is in his train. Any big temple cannot contain God the Father. He humbles himself to meet us and fit in our humble rooms because he is in love with his people.
v.2. "...With two wings they covered their faces, with two they covered their feet,"
The word "they covered" sounds that they are exposed to something that they could not bear. They have been there for decades yet they are not accustomed to the power of his presence. Some worship-leaders are casual because it has been usual to them. These angels are telling us that the Lord is new to them in every fraction of a second. This experience is really awesome, glorious. Wow! What a wonderful God I have!
Love you Lord!!
v. 3. “Holy, holy, holy"
They could not sing except than what they could see. I don't think we can ask these angels to write a song. Their song cannot be long enough. They sing only few things because they are occupied by many things that they could not comprehend. We understand God the Father by seeing that were created (Rom. 1:20). Angels now seeing the Creator and he cannot be fully grasped. Oh my God!
v.4. "At the sound of their voices the doorposts and thresholds shook"
It seems worship shakes the doorposts and thresholds of any physical things. Acts 16:25-26
"About midnight Paul and Silas were praying and singing hymns to God... Suddenly there was such a violent earthquake that the foundations of the prison were shaken...."
In New Testament, we see the same result. When Paul and Silas were singing while praying the prison shook and the doors were opened.
The difference between OT and NT is that, in OT while worship was going on the enemies were confused and killed themselves (2 Chr. 20:21-23). Here in NT jailer also was about to kill himself but since NT comes with a different teaching of forgiveness, Paul saved him. That night the deliverance was not for the Paul and Silas, but it was for the jailer.