Hebrews 3:12-19 KJV

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