Philippians 1:15-18:

Some indeed preach Christ even of envy and strife; and some also of good will:
The one preach Christ of contention, not sincerely, supposing to add affliction to my bonds:
But the other of love, knowing that I am set for the defence of the gospel.
What then? notwithstanding, every way, whether in pretence, or in truth, Christ is preached; and I therein do rejoice, yea, and will rejoice.

See also:

Beating Ministerial Jealousy and Insecurity
Objection: The Doctrine of Faith Healing Puts the Sick Under Condemnation
Objection: Some “Faith Healers” Have Been Exposed as Greedy Charlatans