Al-Kāfi - The Book of Adjudication and Rules

Al-Kāfi - The Book of Adjudication and Rules Chapter: One who Does not have Testimony, then Oath is Turned on Him 1- أَبُو عَلِيٍّ الأشْعَرِيُّ عَنْ ٠َّدِ بْنِ عَبْدِ الْجَبَّارِ عَنْ صَفْوَانَ عَنِ الْعَلاءِ عَنْ ٠) فِي الرَّجُلِ يَدَّعِي وَلا بَيِّنَةَ لَهُ قَالَ يَسْتَحْلِفُهُ فَإِنْ رَدَّ الْيَ٠ِينَ عَلَى صَاحِبِ الْحَقِّ فَلَ٠ْ يَحْلِفْ فَلا حَقَّ لَهُ.

One of the two Imam, (abu Ja‘far or abu ‘Abd Allah), ‘Alayhim al-Salam, has said, ‘He must ask him (defendant) to take an oath; and if he turns the oath on the plaintiff who does not take oath, then he has no right.’” صحيح - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (4/282))