Hebrews 3
16 Ref For some, when they had heard, did provoke: howbeit not all that came out of Egypt by Moses.
17 Ref But with whom was he grieved forty years? was it not with them that had sinned, whose carcases fell in the wilderness?
18 Ref And to whom sware he that they should not enter into his rest, but to them that believed not?
19 Ref So we see that they could not enter in because of unbelief.