2 Timothy 2:11-13:

It is a faithful saying: For if we be dead with him, we shall also live with him:
If we suffer, we shall also reign with him: if we deny him, he also will deny us:
If we believe not, yet he abideth faithful: he cannot deny himself.

See also:

Objection: Healing Cannot Be in the Atonement Because Healing Can Be Lost, but Salvation Cannot Be Lost