Revelation 10:3

And cried with a loud voice, as when a lion roareth: this voice suited him who is the Lion of the tribe of Judah: the lion's voice is both loud and terrible. And when he had cried, seven thunders uttered their voices: interpreters judge these seven thunders to signify those judgments of God which should be executed in the world upon the sounding of the seventh trumpet, and precedaneous to the day of judgment, which we shall find more fully opened under the seventh trumpet by the seven vials poured out, which signify the same thing; yet some understand by these seven thunders the powerful preaching the gospel; but the other seemeth more probable.