Hadith of the Heart (Qalb)

The Prophet of Mercy, Sayyiduna Muhammad al-Mustafa salla’llahu ‘alayhi wa sallam said :

‘Surely there is in the body a small piece of flesh; if it is good, the whole body is good, and if it is corrupted, the whole body is corrupted, and that is surely the heart’.

Related by Imam Bukhārī in his sahih