Sahih Bukhari
Sahih Bukhari Volume 003, Book 048, Hadith Number 845.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 48. Witnesses
Narated By Um Salama : Once Allah's Apostle said, "You people present your cases to me and some of you may be more eloquent and persuasive in presenting their argument. So, if I give some one's right to another (wrongly) because of the latter's (tricky) presentation of the case, I am really giving him a piece of fire; so he should not take it."