Distance yourself from matters of doubt since what is permissible or prohibited has already been made clear

I heard Messenger of Allah (may peace be upon himn) as having said this (and Nu'man) pointed towards his ears with his fingers): What is lawful is evident and what is unlawful is evident, and in between them are the things doubtful which many people do not know. So he who guards against doubtful things keeps his religion and honour blameless, and he who indulges in doubtful things indulges in fact in unlawful things, just as a shepherd who pastures his animals round a preserve will soon pasture them in it. Beware, every king has a preserve, and the things God his declaced unlawful are His preserves. Beware, in the body there is a piece of flesh; if it is sound, the whole body is sound and if it is corrupt the whole body is corrupt, and hearken it is the heart.  

سَمِعْتُ رَسُولَ اللَّهِ ﷺ 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 فِي الشُّبُهَاتِ وَقَعَ فِي الْحَرَامِ كَالرَّاعِي يَرْعَى حَوْلَ الْحِمَى يُوشِكُ أَنْ يَرْتَعَ فِيهِ۔ أَلاَ وَإِنَّ لِكُلِّ مَلِكٍ حِمًى۔ أَلاَ وَإِنَّ حِمَى اللَّهِ مَحَارِمُهُ۔ أَلاَ وَإِنَّ فِي الْجَسَدِ مُضْغَةً إِذَا صَلَحَتْ صَلَحَ الْجَسَدُ كُلُّهُ، وَإِذَا فَسَدَتْ فَسَدَ الْجَسَدُ كُلُّهُ۔ أَلاَ وَهِيَ الْقَلْبُ۔»  

This hadith has been narrated on the authority of Zakariya with the same chain of transmitters.  

حَدَّثَنَا زَكَرِيَّاءُ بِهَذَا الإِسْنَادِ مِثْلَهُ  

AI-Nu'man b. Bashir reported it from Allah's Apostle ﷺ. The hadith narrated by Zakariya is, however, more complete and lengthy than the other ones.  

عَنِ النَّبِيِّ ﷺ بِهَذَا الْحَدِيثِ غَيْرَ أَنَّ حَدِيثَ زَكَرِيَّاءَ أَتَمُّ مِنْ حَدِيثِهِمْ وَأَكْثَرُ  

I heard Messenger of Allah (way peace be upon him) as saying: The lawful is evident and the unlawful is evident, the rest of the hadith is the same as related by Zakariya.  

أَنَّهُ سَمِعَ نُعْمَانَ بْنَ بَشِيرِ بْنِ سَعْدٍ صَاحِبَ رَسُولِ اللَّهِ ﷺ وَهُوَ يَخْطُبُ النَّاسَ بِحِمْصَ وَهُوَ يَقُولُ سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ الْحَلاَلُ بَيِّنٌ وَالْحَرَامُ بَيِّنٌ فَذَكَرَ بِمِثْلِ حَدِيثِ زَكَرِيَّاءَ عَنِ الشَّعْبِيِّ إِلَى قَوْلِهِ يُوشِكُ أَنْ يَقَعَ فِيهِ