Sayyiduna Ibn Abbas (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) said: "If people were given according to their claims, some people would claim the wealth and the blood of others; but the oath is upon the one against whom the claim is made."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11178