It is narrated from Hazrat Nu'man bin Bashir (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "The lawful is clear and the unlawful is clear, and between them are doubtful matters. Whoever leaves these doubtful matters will easily be able to leave the unlawful. And the sanctities of Allah are His pastures, and whoever grazes his animals around the pasture is at risk of entering it. Remember, there is a piece of flesh in the body; if it is sound, the whole body is sound, and if it is corrupt, the whole body is corrupt. Remember! That is the heart."