Qais bin Sa'd says that he also found in the writings of Hazrat Sa'd bin Ubadah (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) gave a verdict by taking an oath along with one witness.
Hadith Referenceمسند احمد / مسند الأنصار رضي الله عنهم / 22460
Hadith Gradingحکم دارالسلام:صحيح لغيره، وإسناده ضعيف لاضطرابه، إسماعيل بن عمرو وأبوه لا يعرفان