English Translation of Hadith
Hazrat Abu Hurairah (May Allah be pleased with him) reported: The Messenger of Allah [SAWW](PBUH) said, Hazrat Numan bin Bashir (May Allah be pleased with him) reported: The Messenger of Allah [SAWW](PBUH) said, Verily, there is a piece of flesh in the body, if it is healthy, the whole body is healthy, and if it is corrupt, the whole body is corrupt. Verily, it is the heart.”
[Muslim Book 10, Chapter 41, Hadith # 3882].
Lesson : as mentioned above in Surah As-Sajda Ayat 09. “Allah gave you hearing (ears), sight (eyes) and hearts”, important point underlying this Hadith concerns the heart. Its purity or impurity directly affects the human conduct in a good or bad way. It is, therefore, absolutely necessary to cleanse the heart of all wiles and impurities, and this is not possible without sound Faith and consciousness of Allah.