The words “formless” and “empty” can be literally translated “unformed and unfilled.” This phrase is the literary key to the creation account. In the first three days the earth was “formed,” and in the second three it was “filled.” The arrangement of those first six days shows a clear order in God’s creation. More
Hughes, Robert B., and J. Carl Laney. Tyndale Concise Bible Commentary. Wheaton, IL: Tyndale House Publishers, 2001. Print. The Tyndale Reference Library.