Sayyiduna Abdullah (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: "Whoever swears a binding oath and seeks by it to take a Muslim's wealth will meet Allah while He is angry with him." Allah sent down a confirmation of this: "Indeed, those who exchange the covenant of Allah and their oaths for a small price" [Surah Al Imran: 77]. Sayyiduna Ash'ath bin Qays (may Allah be pleased with him) came and asked: What did Abu Abd al-Rahman narrate? They said: Such and such. He said: It was revealed concerning me. There was a well of mine in the land of a cousin of mine. I came to the Prophet (peace and blessings be upon him), and he (peace and blessings be upon him) said: "Your proof, or his oath." I said: O Messenger of Allah, he will swear the oath. So the Messenger of Allah (peace and blessings be upon him) said: "Whoever swears a binding oath while lying in it, seeking only to seize a Muslim's wealth, will meet Allah while Allah is angry with him."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الشهادات / 21204