It is narrated from Sayyiduna Nu’man bin Bashir (may Allah be pleased with him), he says: I heard the Messenger of Allah (peace and blessings be upon him) saying this, and at the same time he pointed towards his ears: Indeed, the lawful is clear and the unlawful is clear, but between the lawful and unlawful there are some doubtful matters, many people are unaware of whether they are lawful or unlawful. Whoever avoids these doubtful matters has protected his religion and honor, and whoever indulges in them is close to falling into the unlawful. Its example is like a man who grazes his animals near a sanctuary; it is possible that they may enter it. Every king has a forbidden area, and the forbidden things of Allah Almighty are His prohibited matters. There is a piece of flesh in the human body; if it is sound, the whole body is sound, and if it is corrupt, the whole body is corrupt. Beware! That is the heart.