Hebrews 3:19 YLT

¹⁷  but with whom was He grieved forty years? was it not with those who did sin, whose carcasses fell in the wilderness?

¹⁸  and to whom did He swear that they shall not enter into His rest, except to those who did not believe? --

¹⁹  and we see that they were not able to enter in because of unbelief.