The Book of Transactions (Kitab Al-Buyu`)

Muslim :: Book 10 : Hadith 3779

A'isha (Allah be pleased with her) reported: Allah's Messenger (may peace be upon him) heard the voices of altercation of two disputants at the door; both the voices were quite loud. The one demanded some remission and desired that the other one should show leniency to him, whereupon the (other one) was saying: By Allah will not do that. Then there came Allah's Messenger (may peace be upon him) to them and said: Where is he who swears by Allah that he would not do good? He said: Massenger of Allah, it is I. He may do as he desires.

Source materials are from the University of Southern California MSA site
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