Hebrews 3:12-14:

Take heed, brethren, lest there be in any of you an evil heart of unbelief, in departing from the living God.
But exhort one another daily, while it is called To day; lest any of you be hardened through the deceitfulness of sin.
For we are made partakers of Christ, if we hold the beginning of our confidence stedfast unto the end;

See also:

Objection: Healing Cannot Be in the Atonement Because Healing Can Be Lost, but Salvation Cannot Be Lost
Objection: We Don’t Have to Keep Getting Saved the Way We Have to Keep Getting Healed, So Healing Can’t Be in the Atonement