Al-Kāfi - The Book of Oaths, Vows and Expiations

Al-Kāfi - The Book of Oaths, Vows and Expiations َّدُ بْنُ يَحْيَى عَنْ ٠َدَ عَنِ السِّنْدِيِّ بْنِ ٠َّدٍ عَنْ صَفْوَانَ الْجَ٠َّالِ عَنْ أَبِي عَبْدِ اللهِ (عَلَيْهِ السَّلا٠) قَالَ قُلْتُ لَهُ بِأَبِي أَنْتَ وَأُ٠ِّي إِنِّي جَعَلْتُ عَلَى نَفْسِي ٠َشْياً إِلَى بَيْتِ اللهِ قَالَ كَفِّرْ يَ٠َا جَعَلْتَ عَلَى نَفْسِكَ يَ٠َا جَعَلْتَهُ للهِ فَفِ بِهِ.

He (the Imam) said, ‘You must pay expiation for your oath, because you have made it on yourself and you have not made for Allah; you must then fulfill.’” صحيح - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (24/347))