Ja'far bin Muhammad (may Allah have mercy on him) narrated that I heard Hakam bin 'Utaybah asking my father while he was standing with his hand on the wall of a grave: (He asked) "Did the Prophet ﷺ give a judgment with an oath and one witness?" He replied: "Yes, and likewise 'Ali (may Allah be pleased with him) gave a judgment among you."
Hadith Referenceمسند الإمام الشافعي / كتاب القضاء والأحكام والدعاوى والبينات واليمين ومع الشاهد والأيمان والشهادات / 1716
Hadith Takhrijاسناده ضعيف لإرساله الا ان المتن صحيح اخرجه البيهقي : 10/ 173 - وفى المعرفة السنن والآثار له (5917)۔