Hebrews 3:13-15

13But encourage yourselves each day, as long as it is called To-day, that none of you be hardened by the deceitfulness of sin.

14For we are become companions of the Christ if indeed we hold the beginning of the assurance firm to the end;

15in that it is said, To-day if ye will hear his voice, do not harden your hearts, as in the provocation;