For thus He spoke: “Be ye merciful, that ye may obtain mercy; forgive that it may be forgiven to you; as ye do, so shall it be done unto you; as ye judge, so shall ye be judged; as ye are kind, so shall kindness be shown to you; with what measure ye mete, with the same it shall be measured to you.”
Clement of Rome
First Epistle to the Corinthians
Chapter XIII