757 - وَقَالَ مُحَمَّدُ بْنُ مُسْلِمٍ لِأَبِي جَعْفَرٍ عَلَيْهِ اَلسَّلاَمُ: اَلدَّمُ يَكُونُ فِي اَلثَّوْبِ عَلَيَّ وَ أَنَا فِي اَلصَّلاَةِ فَقَالَ «إِنْ رَأَيْتَهُ وَ عَلَيْكَ ثَوْبٌ غَيْرُهُ فَاطْرَحْهُ وَ صَلِّ فِي غَيْرِهِ وَ إِنْ لَمْ يَكُنْ عَلَيْكَ ثَوْبٌ غَيْرُهُ فَامْضِ فِي صَلاَتِكَ وَ لاَ إِعَادَةَ عَلَيْكَ مَا لَمْ يَزِدْ عَلَى مِقْدَارِ دِرْهَمٍ فَإِنْ كَانَ أَقَلَّ مِنْ دِرْهَمٍ فَلَيْسَ بِشَيْءٍ رَأَيْتَهُ أَوْ لَمْ تَرَهُ وَ إِذَا كُنْتَ قَدْ رَأَيْتَهُ وَ هُوَ أَكْثَرُ مِنْ مِقْدَارِ اَلدِّرْهَمِ فَضَيَّعْتَ غَسْلَهُ وَ صَلَّيْتَ فِيهِ صَلَوَاتُ كَثِيرَةً فَأَعِدْ مَا صَلَّيْتَ فِيهِ وَ لَيْسَ ذَلِكَ بِمَنْزِلَةِ اَلْمَنِيِّ وَ اَلْبَوْلِ» ثُمَّ ذَكَرَ عَلَيْهِ اَلسَّلاَمُ اَلْمَنِيَّ فَشَدَّدَ فِيهِ وَ جَعَلَهُ أَشَدَّ مِنَ اَلْبَوْلِ ثُمَّ قَالَ عَلَيْهِ اَلسَّلاَمُ «إِنْ رَأَيْتَ اَلْمَنِيَّ قَبْلُ أَوْ بَعْدُ فَعَلَيْكَ اَلْإِعَادَةُ إِعَادَةُ اَلصَّلاَةِ وَ إِنْ أَنْتَ نَظَرْتَ فِي ثَوْبِكَ فَلَمْ تُصِبْهُ وَ صَلَّيْتَ فِيهِ فَلاَ إِعَادَةَ عَلَيْكَ وَ كَذَا اَلْبَوْلُ.
Hadith.757 - Muhammad ibn Muslim said to Imam Muhammad ibn Ali Al-Baqir 
about the presence of blood on a garment while in prayer.
Imam said: "If you see it and have another garment with you, remove it and pray in the other garment. If you do not have another garment, continue your prayer, and you do not have to repeat it, provided that the blood does not exceed the size of a dirham.
If it is less than a dirham, it is of no consequence whether you see it or not. But if you saw it and it was more than a dirham's size and neglected to wash it, and you prayed multiple prayers in that state, you must repeat all the prayers you performed in that garment.
However, this is not the same ruling as for semen or urine."
Imam then emphasized that the impurity of semen is more severe than urine and said:
"If you see semen before or after, you must repeat the prayer. If you inspected your garment and did not find it and prayed, there is no need for repetition, and the same applies for urine”.
