Narrated Abdullah ibn Abbas: Two men brought their dispute to the Prophet ﷺ. The Prophet ﷺ asked the plaintiff to produce evidence, but he had no evidence. So he asked the defendant to swear. He swore by Allah "There is no god but He. " The Messenger of Allah ﷺ said: Yes, you have done it, but you have been forgiven for the sincerity of the statement: "There is no god but Allah. " Abu Dawud said: This tradition means that he did not command him to make atonement
Hadith Referenceسنن ابي داود / كتاب الأيمان والنذور / 3275
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:إسناده حسن
Narrated Abdullah ibn Abbas: The Holy Prophet ﷺ said to a man whom he asked to take an oath: Swear by Allah except whom there is no god that you have nothing belonging to him, i. e. the plaintiff.
Hadith Referenceسنن ابي داود / كتاب الأقضية / 3620
Hadith Gradingالألبانی:ضعيف الإسناد | زبیر علی زئی:حسن, مشكوة المصابيح (3774), انظر الحديث السابق (3275)
Hadith Takhrij« تفرد بہ أبوداود، (تحفة الأشراف: 5431)، وقد أخرجہ: مسند احمد 1/288) (ضعیف الإسناد) » (اس کے راوی عطاء اخیر عمر میں مختلط ہو گئے تھے )