Revelation 6:1

And (1) I saw when the Lamb opened one of the seals, and I heard, as it were the noise of thunder, one of the four beasts saying, Come and see.

(1) This is the second part of this first history (which I said was common and of the whole world) of the works of God in the government of all things. There are generally three parts to this: the forewarning, the caution, and the execution of all the evils which God sends on this world, which was scarcely postponed by him. The forewarning is set down in this chapter, the caution for preserving the Church is in the next chapter, and the execution is described in (Revelation 8:9) In each part of the forewarning, there are three points: the distinct and express calling of John to prepare himself to take knowledge of the things that are to be showed to him in the opening of the seals, the sign, and the word expounding the sign. Though the express calling of John is used in only four of the signs, yet the same is also to be understood in the rest that follow. The author of the forewarnings is the Lamb as that word of the Father made the Mediator, opening the seals of the book. The instruments are the angels in most of the visions, who explain the sign and the words of it. Now this first verse contains an express calling of John to record the opening of the first seal.