Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said: Whoever swears an oath to seize another's wealth while he is lying in that oath will meet Allah in a state in which Allah is angry with him. The confirmation of this is in the Qur'an: "Indeed, those who exchange the covenant of Allah and their oaths for a small price" [Surah Al Imran: 77]. Then Sayyiduna Ash'ath bin Qays (may Allah be pleased with him) came out to us and said: "What has Abu Abd al-Rahman narrated to you?" We told him what he had said. He said: "He spoke the truth. This verse was revealed concerning me, for there was a dispute between me and a man over a well. We took our dispute to the Messenger of Allah (peace and blessings be upon him), and he (peace and blessings be upon him) said: 'Proof is upon you and the oath is upon him.' I said: He will swear the oath and will not care. He (peace and blessings be upon him) said: 'Whoever swears an oath while he is lying will meet Allah while Allah is angry with him.' Allah sent down a confirmation of this." Then he recited this verse: "Indeed, those who exchange the covenant of Allah and their oaths for a small price" [Surah Al Imran: 77].
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الشهادات / 21205