Deuteronomy 1:28

And they said, “Come, let us build for ourselves a city, and a tower whose top will reach into heaven, and let us make for ourselves a name, lest we be scattered over the face of the whole earth.”

“Nevertheless, the people who live in the land are strong, and the cities are fortified and very large; and moreover, we saw the descendants of Anak there.

But the men who had gone up with him said, “We are not able to go up against the people, for they are too strong for us.”

“There also we saw the Nephilim (the sons of Anak are part of the Nephilim); and we became like grasshoppers in our own sight, and so we were in their sight.”

“Hear, O Israel! You are crossing over the Jordan today to go in to dispossess nations greater and mightier than you, great cities fortified to heaven,

“But they, our fathers, acted presumptuously; They became stiff-necked and would not listen to Your commandments.