Hebrews 2:1-3:

Therefore we ought to give the more earnest heed to the things which we have heard, lest at any time we should let them slip.
For if the word spoken by angels was stedfast, and every transgression and disobedience received a just recompence of reward;
How shall we escape, if we neglect so great salvation; which at the first began to be spoken by the Lord, and was confirmed unto us by them that heard him;

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