Then, when the Lamb opened the seventh seal, there was silence in heaven for about half an hour.
Then I saw the seven angels who stand before God, and seven trumpets were given to them.
References for Revelation 8:2
Another angel came and stood at the altar, and he held a gold bowl for burning incense. He was given a large amount of incense, in order to offer it on behalf of the prayers of all the saints on the gold altar in front of the throne.
The smoke of the incense offered for the prayers of the saints rose up before God from the angel's hand.
Then the angel took the incense container and filled it with fire from the altar. He threw it down to the earth, and there were thunder, voices, lightning, and an earthquake.
Then the seven angels who held the seven trumpets got ready to blow them.