Revelation 8:1

Overview - Revelation 8
1	At the opening of the seventh seal,
2	Seven angels have seven trumpets given them.
6	Four of them sound their trumpets and great plagues follow.
9	Another angel puts incense to the prayers of the saints on the golden altar.

Revelation 8:1  (King James Version)
And when he had opened the seventh seal, there was silence in heaven about the space of half an hour.