Sahih Muslim 356

It is narrated on the authority of Abdullah that he heard the Prophet (ﷺ) 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 (ﷺ). Upon this he remarked: Either (you should produce) two witnesses (to support your contention) or his oath (would be accepted as valid)