In Context

16 for certain having heard did provoke, but not all who did come out of Egypt through Moses;

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.

Hebrews 3:19 in Other Translations