Colossians 3:25:

But he that doeth wrong shall receive for the wrong which he hath done: and there is no respect of persons.

See also:

The Baseball Diamond of Healing
God Does Not Play Favorites
Sickness as Chastening and Judgment in the New Testament
Why Can’t I Get Healed?
Objection: It’s up to God – God Will Heal Me If He Wants To
Objection: 3 John 2 Is a Greeting and Cannot Be Claimed as a Promise
Objection: The Lord Kills, Brings Down to the Grave, and Makes Poor (1 Samuel 2:6-7)
Objection: Any Other Objection Not Specifically Covered in This Book