Galatians 3:22:

But the scripture hath concluded all under sin, that the promise by faith of Jesus Christ might be given to them that believe.

See also:

What Mark 11:22 Really Means
What Galatians 2:20 Really Means
Objection: Mark 16:18 Speaks Collectively – Only Those Who Actually Have Gifts of Healings Can Heal the Sick by Laying On of Hands