There are some things which are not directly referred to in the Quran or the Sahih Ahadith. However, for such things the Prophet Muhammad (S) did say something which is included in Sahih al-Bukhari, Volume 1, Book of Belief, Hadith 49:
Narrated An Numan bin Bashir
I heard Allah's Apostle saying, 'Both legal and illegal things are evident but in between them there are doubtful (suspicious) things and most of the people have no knowledge about them. So whoever saves himself from these suspicious things saves his religion and his honor. And whoever indulges in these suspicious things is like a shepherd who grazes (his animals) near the Hima (private pasture) of someone else and at any moment he is liable to get in it. (O people!) Beware! Every king has a Hima and the Hima of Allah on the earth is His illegal (forbidden) things. Beware! There is a piece of flesh in the body if it becomes good (reformed) the whole body becomes good but if it gets spoilt the whole body gets spoilt and that is the heart.
A good example is that of music. According to Sheikh Yusuf Qardawi, musical instruments are allowed in Islam. However, the rest of the scholars are of the view that, with the exception of duff, all musical instruments are considered as haram. In this case, then, we can apply the teaching of this hadith that we should abstain from the musical instruments.
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