What is the detailed explanation of the Hadith: "The lawful is clear and the unlawful is clear, and between them are matters that are doubtful, concerning which not many people have knowledge. Thus, he who guards against doubtful matters, clears himself in regard to his religion and his honor. And he who falls into doubtful matters, falls into that which is unlawful, like the shepherd who pastures around a sanctuary, he will soon pasture within it. Verily, every king has a sanctuary, and verily, Allah’s sanctuary is His prohibitions. Verily, in the body there is a piece of flesh which, if it is sound, the whole body is sound, and if it is corrupt, the whole body is corrupt. Verily, it is the heart"?

The meaning of the Hadith, "The lawful is clear, and the unlawful is clear, and between them are doubtful matters": Things are of three types: clearly lawful, clearly unlawful, and doubtful matters that are not clear as to their lawfulness or unlawfulness.

So, whoever avoids doubtful matters has "cleared himself in regard to his religion and his honor," meaning: he has achieved freedom for his religion from legal blame, and he has protected his honor from people's gossip.

His saying: "Indeed, every king has a sanctuary, and the sanctuary of Allah is His prohibitions" means that Allah Almighty has forbidden certain acts of disobedience, and whoever approaches them is close to falling into them.

"Indeed, 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. Indeed, it is the heart." The Hadith emphasizes the importance of rectifying the heart. The view of the Ahl al-Sunnah and the majority of theologians is that the intellect resides in the heart.