Text: Revelation 6:9-17Intro: As we continue our journey in the book of Revelation, we are just beginning to deal with the events related to the Tribulation. We see both saints and sinners engaged in the business of prayer. You might think that the Tribulation Period will be a time period devoid of prayer and religious activity. We are about to see that just the opposite is true. There will be prayer in Heaven and there will be prayer upon the earth. History’s greatest prayer meeting will take place during the Great Tribulation.