2 Chronicles 7:1-3 NKJV
When Solomon had finished praying, fire came down from heaven and consumed the burnt offering and the sacrifices; and the glory of the Lord filled the temple. And the priests could not enter the house of the Lord, because the glory of the Lord had filled the Lord's house. When all the children of Israel saw how the fire came down, and the glory of the Lord on the temple, they bowed their faces to the ground on the pavement, and worshipped and praised the Lord saying, "For He is good, for His mercy endures forever."
We saw an example in 2 Chronicles 5 where the praise and worship leaders were saying, "For He is good, for His mercy endures forever" and the cloud of God's presence filled the temple. Here in the 7th chapter we see that Solomon's prayer when he dedicated the temple was followed by God's glory filling the temple. Then the people responded with the same words, "For He is good, for His mercy endures forever." Celebration of God's mercy preceded the manifestation of His glory and celebration of His mercy followed the manifestation of His glory. We ought to praise Him for His mercy until the glory shows up, and then praise Him again for His mercy that caused the glory to manifest.