Mishkat al-Masabih #3603
The Offices of Commander and Qadi
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنِ ابْنِ عَبَّاسٍ: أَنَّ رَسُولَ اللَّهِ صَلَّى الله عَلَيْهِ وَسلم قضى بِيَمِين وَشَاهد. رَوَاهُ مُسلم
Ibn ‘Abbas said that God's Messenger gave a decision on the basis of an oath and a single witness.
Muslim transmitted it.
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About Mishkat al-Masabih
This hadith is #3603 from Mishkat al-Masabih, in the Book of The Offices of Commander and Qadi.