"‏ الْحَلاَلُ بَيِّنٌ وَالْحَرَامُ بَيِّنٌ وَبَيْنَهُمَا مُشْتَبِهَاتٌ لاَ يَعْلَمُهَا كَثِيرٌ مِنَ النَّاسِ فَمَنِ اتَّقَى الشُّبُهَاتِ اسْتَبْرَأَ لِدِينِهِ وَعِرْضِهِ وَمَنْ وَقَعَ فِي الشُّبُهَاتِ وَقَعَ فِي الْحَرَامِ كَالرَّاعِي حَوْلَ الْحِمَى يُوشِكُ أَنْ يَرْتَعَ فِيهِ أَلاَ وَإِنَّ لِكُلِّ مَلِكٍ حِمًى أَلاَ وَإِنَّ حِمَى اللَّهِ مَحَارِمُهُ أَلاَ وَإِنَّ فِي الْجَسَدِ مُضْغَةً إِذَا صَلُحَتْ صَلُحَ الْجَسَدُ كُلُّهُ وَإِذَا فَسَدَتْ فَسَدَ الْجَسَدُ كُلُّهُ أَلاَ وَهِيَ الْقَلْبُ ‏"

“I heard the Messenger of Allah (ﷺ) say: ‘That which is lawful is plain and that which is unlawful is plain, and between them are matters that are not clear, about which not many people know. Thus he who guards against the unclear matters, he clears himself with regard to his religion and his honor. But he who falls into the unclear matters, he falls into that which is unlawful. Like the shepherd who pastures around a sanctuary, all but grazing therein. Every king has a sanctuary. And beware! Allah’s sanctuary is His prohibitions. Beware! In the body there is a piece of flesh which, if it is sound, the whole body will be sound, and if it is corrupt, the whole body will be corrupt. It is the heart.’”