Revelation 8:2-6

 ² And I saw the seven angels that stand before God; and there were given unto them seven trumpets.

 ³ And another angel came and stood over the altar, having a golden censer; and there was given unto him much incense, that he should add it unto the prayers of all the saints upon the golden altar which was before the throne.

 ⁴ And the smoke of the incense, with the prayers of the saints, went up before God out of the angel's hand.

 ⁵ And the angel taketh the censer; and he filled it with the fire of the altar, and cast it upon the earth: and there followed thunders, and voices, and lightnings, and an earthquake.

 ⁶ And the seven angels that had the seven trumpets prepared themselves to sound.