The prayer of a righteous person is powerful

James 5:16
New International Version (NIV)

¹⁶ Therefore confess your sins to each other and pray for each other so that you may be healed. The prayer of a righteous person is powerful and effective.

James 5:16
New King James Version (NKJV)

¹⁶ Confess your trespasses^[a] to one another, and pray for one another, that you may be healed. The effective, fervent prayer of a righteous man avails much.