Hebrews 3:17-19

21st Century King James Version

¹⁷ But with whom was He grieved forty years? Was it not with those who had sinned, whose carcasses fell in the wilderness?

¹⁸ And to whom did He swear that they should not enter into His rest, but to those who believed not?

¹⁹ So we see that they could not enter in because of unbelief.