Sahih al-Bukhari 7152
Narrated Tarif Abi Tamima:
I saw Safwan and Jundab and Safwan's companions when Jundab was advising. They said, "Did you 
hear something from Allah's Messenger (ﷺ)?" Jundab said, "I heard him saying, 'Whoever does a good deed 
in order to show off, Allah will expose his intentions on the Day of Resurrection (before the people), 
and whoever puts the people into difficulties, Allah will put him into difficulties on the Day of 
Resurrection.'" The people said (to Jundab), "Advise us." He said, "The first thing of the human body 
to purify is the `Abdomen, so he who can eat nothing but good food (Halal and earned lawfully) 
should do so, and he who does as much as he can that nothing intervene between him and Paradise by 
not shedding even a handful of blood, (i.e. murdering) should do so."
حَدَّثَنَا إِسْحَاقُ الْوَاسِطِيُّ، حَدَّثَنَا خَالِدٌ، عَنِ الْجُرَيْرِيِّ، عَنِ طَرِيفٍ أَبِي تَمِيمَةَ، قَالَ شَهِدْتُ صَفْوَانَ وَجُنْدَبًا وَأَصْحَابَهُ وَهْوَ يُوصِيهِمْ فَقَالُوا هَلْ سَمِعْتَ مِنْ رَسُولِ اللَّهِ صلى الله عليه وسلم شَيْئًا قَالَ سَمِعْتُهُ يَقُولُ ‏"‏ مَنْ سَمَّعَ سَمَّعَ اللَّهُ بِهِ يَوْمَ الْقِيَامَةِ ـ قَالَ ـ وَمَنْ يُشَاقِقْ يَشْقُقِ اللَّهُ عَلَيْهِ يَوْمَ الْقِيَامَةِ ‏"‏‏.‏ فَقَالُوا أَوْصِنَا‏.‏ فَقَالَ‏"‏ إِنَّ أَوَّلَ مَا يُنْتِنُ مِنَ الإِنْسَانِ بَطْنُهُ، فَمَنِ اسْتَطَاعَ أَنْ لاَ يَأْكُلَ إِلاَّ طَيِّبًا فَلْيَفْعَلْ، وَمَنِ اسْتَطَاعَ أَنْ لاَ يُحَالَ بَيْنَهُ وَبَيْنَ الْجَنَّةِ بِمِلْءِ كَفِّهِ مِنْ دَمٍ أَهْرَاقَهُ فَلْيَفْعَلْ ‏"‏‏.‏ قُلْتُ لأَبِي عَبْدِ اللَّهِ مَنْ يَقُولُ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم جُنْدَبٌ قَالَ نَعَمْ جُنْدَبٌ‏.‏