مِشْكَاةُ الْمَصَابِيحِ
Mishkat al-Masabih 3763
The Offices of Commander and Qadi
Cases and Depositions - Section 1
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.
Mishkat al-Masabih, 3763صَحِيحٌ (الألباني)