Preparation for the wrath of God

Rev 15:5 And after that I looked, and, behold, the temple of the tabernacle of the testimony in heaven was opened:
Rev 15:6 And the seven angels came out of the temple, having the seven plagues, clothed in pure and white linen, and having their breasts girded with golden girdles.
Rev 15:7 And one of the four beasts gave unto the seven angels seven golden vials full of the wrath of God, who liveth for ever and ever.
Rev 15:8 And the temple was filled with smoke from the glory of God, and from his power; and no man was able to enter into the temple, till the seven plagues of the seven angels were fulfilled.
Rev 16:1 And I heard a great voice out of the temple saying to the seven angels, Go your ways, and pour out the vials of the wrath of God upon the earth.

As we have seen in the section "The temple of the tabernacle of the testimony in heaven" these plagues fall after the close of the ministration in the sanctuary, for the temple is opened before they are poured out.

The "seven golden vials full of the wrath of God" are given to seven angels clothed in linen pure and white, a fit emblem of the purity of God's righteousness and justice in the infliction of these judgments.

They receive these vials from one of the four beasts, or living creatures. These living beings were shown in comments on Revelation 4 to be a class of Christ's  assistants in His sanctuary work. How appropriate then that they should be the ones to deliver to the ministers of vengeance the vials of the wrath to be poured upon those who have slighted Christ's mercy, abused His long-suffering, heaped contumely upon His name, and crucified Him afresh in the persecution of His followers!