Israel initially refused to enter the land because of giants, and only men of great faith (Joshua, Caleb, and David) were able to defeat them.
Pastors and theologians tend to skip over the many references to giants in the Bible. However, Douglas Van Dorn tackles this subject head on in his book, Giants: Sons of the Gods.
Michael Heiser’s The Unseen Realm is a book that every serious student of the Bible should take up. This book challenges conventional interpretations of Scripture and provokes the reader to consider a more supernatural view of the world than he likely holds. Hence the subtitle of the book, Recovering the Supernatural Worldview of the Bible.