But the men that went up with him said, We be not able to go up against the people; for they are stronger than we.
Numbers 32:9
For when they went up unto the valley of Eshcol, and saw the land, they discouraged the heart of the children of Israel, that they should not go into the land which the LORD had given them.
Deuteronomy 1:28
Whither shall we go up? our brethren have discouraged our heart, saying, The people is greater and taller than we; the cities are great and walled up to heaven; and moreover we have seen the sons of the Anakims there.
Joshua 14:8
Nevertheless my brethren that went up with me made the heart of the people melt: but I wholly followed the LORD my God.
Hebrews 3:19
So we see that they could not enter in because of unbelief.