Arabic (Original)
حَدَّثَنَا إِسْمَاعِيلُ أَخْبَرَنَا هِشَامٌ الدَّسْتُوَائِيُّ عَنْ يَحْيَى بْنِ أَبِي كَثِيرٍ عَنْ زَيْدِ بْنِ سَلَّامٍ عَنْ جَدِّهِ مَمْطُورٍ عَنْ أَبِي أُمَامَةَ قَالَ قَالَ رَجُلٌ يَا رَسُولَ اللَّهِ مَا الْإِيمَانُ قَالَ إِذَا سَرَّتْكَ حَسَنَتُكَ وَسَاءَتْكَ سَيِّئَتُكَ فَأَنْتَ مُؤْمِنٌ فَقَالَ يَا رَسُولَ اللَّهِ فَمَا الْإِثْمُ قَالَ إِذَا حَاكَ فِي صَدْرِكَ شَيْءٌ فَدَعْهُ.
English Translation
Isma'il told us, Hisham al-Dastuwa'i informed us, from Yahya ibn Abi Kathir, from Zayd ibn Sallam, from his grandfather Mamtur, from Abu Umamah, who said: A man said, "O Messenger of Allah, what is faith?" He said: "When your good deed pleases you and your bad deed grieves you, then you are a believer." He said, "O Messenger of Allah, what is sin?" He said: "When something stirs uneasily in your breast, then leave it."