Ibn `Abbas wrote that the Prophet (ﷺ) gave his verdict on the basis of the defendant's oath.
Sahih al-Bukhari Book 52, Hadith 31
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Allah's Messenger (ﷺ) said, "If somebody takes a false oath in order to get the property of a Muslim (unjustly) by that oath, then Allah will be angry with him when he will meet Him." Al-Ash'ath informed me, "By Allah! This was said regarding me. There was a dispute about a piece of land between me and a man from the Jews who denied my right. I took him to the Prophet. Allah's Messenger (ﷺ) asked me, 'Do you have an evidence?' I replied in the negative. He said to the Jew, 'Take an oath.' I said, 'O Allah's Messenger (ﷺ)! He will surely take an oath and take my property unjustly." So, Allah revealed: "Verily! Those who purchase a little gain at the cost of Allah's covenant and their oaths . . . " (3.77)
Sahih al-Bukhari Book 52, Hadith 30 Next Hadith → `Abdullah (bin Mas`ud) said, "Whoever takes a (false) oath in order to grab some property (unjustly), Allah will be angry with him when he will meet Him. Allah confirmed that through His Divine Revelation: "Verily! Those who purchase a little gain at the cost of Allah's covenant and their oaths . . . they will have a painful punishment." (3.77) Al-Ash'ath bin Qais came to us and asked, 'What is Abu `Abdur-Rahman (i.e. `Abdullah) telling you? 'We told him what he was narrating to us. He said, 'He was telling the truth; this Divine Verse was revealed in connection with me. There was a dispute between me and another man about something and the case was filed before Allah's Messenger (ﷺ) who said, 'Produce your two witnesses or else the defendant is to take an oath.' I said, The defendant will surely take a (false) oath caring for nothing.' The Prophet (ﷺ) said, 'Whoever takes a false oath in order to grab (other's) property, then Allah will be angry with him when he will meet Him.' Then Allah revealed its confirmation. Al-Ashath then recited the above Divine Verse." (3.77)
Sahih al-Bukhari Book 52, Hadith 32
Sahih al-Bukhari Book 52, Hadith 30 Next Hadith → `Abdullah (bin Mas`ud) said, "Whoever takes a (false) oath in order to grab some property (unjustly), Allah will be angry with him when he will meet Him. Allah confirmed that through His Divine Revelation: "Verily! Those who purchase a little gain at the cost of Allah's covenant and their oaths . . . they will have a painful punishment." (3.77) Al-Ash'ath bin Qais came to us and asked, 'What is Abu `Abdur-Rahman (i.e. `Abdullah) telling you? 'We told him what he was narrating to us. He said, 'He was telling the truth; this Divine Verse was revealed in connection with me. There was a dispute between me and another man about something and the case was filed before Allah's Messenger (ﷺ) who said, 'Produce your two witnesses or else the defendant is to take an oath.' I said, The defendant will surely take a (false) oath caring for nothing.' The Prophet (ﷺ) said, 'Whoever takes a false oath in order to grab (other's) property, then Allah will be angry with him when he will meet Him.' Then Allah revealed its confirmation. Al-Ashath then recited the above Divine Verse." (3.77)
Sahih al-Bukhari Book 52, Hadith 32