Hebrews 3:16

12Beware, brothers, lest perhaps there might be in any one of you an evil heart of unbelief, in falling away from the living God;

13but exhort one another day by day, so long as it is called “today”, lest any one of you be hardened by the deceitfulness of sin.

14For we have become partakers of Christ, if we hold the beginning of our confidence firm to the end,

15while it is said, “Today if you will hear his voice, don’t harden your hearts, as in the rebellion.”

16For who, when they heard, rebelled? Wasn’t it all those who came out of Egypt led by Moses?

17With whom was he displeased forty years? Wasn’t it with those who sinned, whose bodies fell in the wilderness?

18To whom did he swear that they wouldn’t enter into his rest, but to those who were disobedient?

19We see that they weren’t able to enter in because of unbelief.