On the authority of Abu 'Abdullah al-Nu'man bin Bashir, radiyallahu 'anhu, who said: I heard the Messenger of Allah, sallallahu 'alayhi wasallam, say:
"Truly, what is lawful is evident, and what is unlawful is evident, and in
between the two are matters which are doubtful which many people do not
know. 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 flock round a
preserve will soon pasture them in it. Beware, every king has a preserve,
and the things Allah has declared unlawful are His preserves. Beware, in
the body there is a flesh; if it is sound, the whole body is sound, and if it is
corrupt, the whole body is corrupt, and behold, it is the heart."
[Al-Bukhari & Muslim]
