Sahih Muslim Book - 22, Hadith - 4094

حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ نُمَيْرٍ الْهَمْدَانِىُّ حَدَّثَنَا أَبِى حَدَّثَنَا زَكَرِيَّاءُ عَنِ الشَّعْبِىِّ عَنِ النُّعْمَانِ بْنِ بَشِيرٍ قَالَ سَمِعْتُهُ يَقُولُ سَمِعْتُ رَسُولَ اللَّهِ -صلى الله عليه وسلم- يَقُولُ وَأَهْوَى النُّعْمَانُ بِإِصْبَعَيْهِ إِلَى أُذُنَيْهِ « إِنَّ الْحَلاَلَ بَيِّنٌ وَإِنَّ الْحَرَامَ بَيِّنٌ وَبَيْنَهُمَا مُشْتَبِهَاتٌ لاَ يَعْلَمُهُنَّ كَثِيرٌ مِنَ النَّاسِ فَمَنِ اتَّقَى الشُّبُهَاتِ اسْتَبْرَأَ لِدِينِهِ وَعِرْضِهِ وَمَنْ وَقَعَ فِى الشُّبُهَاتِ وَقَعَ فِى الْحَرَامِ كَالرَّاعِى يَرْعَى حَوْلَ الْحِمَى يُوشِكُ أَنْ يَرْتَعَ فِيهِ أَلاَ وَإِنَّ لِكُلِّ مَلِكٍ حِمًى أَلاَ وَإِنَّ حِمَى اللَّهِ مَحَارِمُهُ أَلاَ وَإِنَّ فِى الْجَسَدِ مُضْغَةً إِذَا صَلَحَتْ صَلَحَ الْجَسَدُ كُلُّهُ وَإِذَا فَسَدَتْ فَسَدَ الْجَسَدُ كُلُّهُ أَلاَ وَهِىَ الْقَلْبُ ».

It was narrated that An-Nu'man bin Bashir said: "The Messenger of Allah (s.a.w) said - and An-Nu'man pointed with his fingers to his ears - "That which is lawful is clear and that which is unlawful is clear, and between them are matters which are unclear which many people do not understand. Whoever guards against the unclear matters, he will protect his religion and his honor, but whoever falls into that which is unclear, he will soon fall into that which is unlawful. Like a shepherd who grazes his flock around the sanctuary; he will soon graze in it. Verily, every king has his prohibited land and verily, the prohibited land of Allah is that which He has forbidden. In the body there is a piece of flesh which, if it is healthy, the entire body will be healthy but if it is corrupt, the entire body will be corrupt. Verily it is the heart."