In the beginning God created the heaven and the earth. (Genesis 1:1)

In his commentary on the the first book of Moses (Genesis), commenting on the first verse of the first chapter, Calvin says: "Moses simply intends to assert that the world was not perfected at its very commencement, in the manner in which it is now seen, but that it was created an empty chaos of heaven and earth. His language therefore may be thus explained. When God in the beginning created the heaven and the earth, the earth was empty and waste. He moreover teaches by the word "created," that what before did not exist was now made; for he has not used the term "yatsar", which signifies to frame or forms but "bara", which signifies to create. Therefore his meaning is, that the world was made out of nothing. Hence the folly of those is refuted who imagine that unformed matter existed from eternity; and who gather nothing else from the narration of Moses than that the world was furnished with new ornaments, and received a form of which it was before destitute. This indeed was formerly a common fable among heathens, who had received only an obscure report of the creation, and who, according to custom, adulterated the truth of God with strange figments; but for Christian men to labor (as Steuchus does) in maintaining this gross error is absurd and intolerable. Let this, then be maintained in the first place, that the world is not eternal but was created by God." [More of this commentary online here]