The Book of Faith (Kitab Al-Iman)
Muslim :: Book 1 : Hadith 255
It is narrated on the authority of Abdullah that he heard the Prophet (may peace be upon him) saying: He who took an oath in order to entitle himself (to the possession) of a property, whereas he is a liar, would meet Allah in a state that He would be very much angry with him. Then the remaining part of the hadith was narrated as transmitted by A'mash but with the exception of these words: There was a dispute between me and another person in regard to a well. We referred this dispute to the Messenger of Allah (may peace be upon him). Upon this he remarked: Either (you should produce) two witnesses (to support your contention) or his oath (would be accepted as valid).
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