Hebrews 3:17-19

Young's Literal Translation

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.