The hadith that confirms this reality for you is the one narrated by the two Shaykhs in their Sahihs, from the hadith of al-Nu'man ibn Bashir (may Allah be pleased with both of them), who said: The Messenger of Allah (peace and blessings be upon him) said:

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The Shaykh : What confirms this reality for you is the hadith narrated by the two Shaykhs in their Sahihs, from the hadith of al-Nu'man ibn Bashir (may Allah be pleased with both of them), who said: The Messenger of Allah (peace and blessings be upon him) said:

Know that the lawful is clear, and the forbidden is clear, and between them are matters of doubt about which many people do not know. Whoever avoids the doubtful matters has protected his religion and his honor. And whoever falls into the doubtful matters falls into the forbidden, like a shepherd who grazes his flock around a prohibited area; he is likely to enter it. Know that every king has a prohibited area, and know that the prohibited area of Allah is His forbidden things in His religion. And whoever grazes around the prohibited area is likely to fall into it. Know that every king has a prohibited area, and know that the prohibited area of Allah is His forbidden things. Know that in the body there is a morsel; if it is sound, the whole body is sound, and if it is corrupt, the whole body is corrupt. Know that it is the heart.

إن الحلال بين و الحرام بين و بينهما أمور مشتبهات لا يعلمهن كثير من الناس فمن اتقى الشبهات فقد استبرأ و عرضه ، ومن وقع في الشبهات وقع في الحرام كالراعي يرعى حول الحمى يوشك أن يرتع فيه ، ألا وأن لكل ملك حمى ، ألا وإن حمى الله محارمه لدينه و من حام حول الحمى يوشك أن يقع فيه ألا و إن لكل ملك حمى ألا و إن حمى الله محرامه ألا و إن في الجسد مضغة إذا صلحت صلح الجسد كله و إذا فسدت فسد الجسد كله ألا و هي القلب

In this hadith, there is an explicit statement of what we mentioned in the introduction, which is that the soundness of the heart is through the soundness of the body, and the soundness of the body is through the soundness of the heart. The matter of this spiritual or moral soundness, and the connection between the body and the heart, is exactly like the case in the physical, medical, material aspect. Just as a human body cannot be upright or sound if its heart is sick, and just as this heart cannot be sound and healthy while the body is sick and weak, so each supports the other in strength or weakness, as is the case in the material aspect. So it is the same in the spiritual and religious aspects. This hadith is authentic and explicit for that reason, because it says: if the body becomes corrupt, the heart becomes corrupt, and if the heart becomes corrupt, the body becomes corrupt.

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.

ألا و إن في الجسد مضغة إذا صلحت صلح الجسد كله و إذا فسدت فسد الجسد كله ألا و هي القلب

Sahih al-Bukhari 52

Source alathar.net

The Arabic text is copied verbatim from the original source, without any edits.

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