Al-Kāfi - The Book of Prayer

Chapter: Rules about Performing Salah (Prayer) in an Unclean Cloth Regardless One Knows it or Not 2ـ وَبِهَذَا الإِسْنَادِ عَنْ عَلِيِّ بْنِ ٠َهْزِيَارَ عَنْ فَضَالَةَ بْنِ أَيُّوبَ عَنْ عَبْدِ الله بْنِ سِنَانٍ قَالَ سَأَلْتُ أَبَا عَبْدِ الله (عَلَيْهِ الْسَّلا٠) عَنِ الرَّجُلِ يُصَلِّي وَفِي ثَوْبِهِ عَذِرَةٌ ٠ِنْ إِنْسَانٍ أَوْ سِنَّوْرٍ أَوْ كَلْبٍ أَ يُعِيدُ صَلاَتَهُ فَقَالَ إِنْ كَانَ لَ٠2.

Through the same chain of narrators as that of the previous Hadith it is narrated from Ali ibn Mahziyar from Fadalah ibn Ayyub from ‘Abd Allah ibn Sinan who has said the following: “I once asked abu ‘Abd Allah (a.s.), about a man who performs Salah (prayer) and there is feces of human being, cat or dog in his clothes, ‘Must he perform his Salah (prayer) again?’ He (the Imam) said, ‘He is not required to perform his Salah (prayer) again, if he did not know about it.’” صحيح - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (15/323))