Musannaf Ibn Abi Shaybah 32333 — Reports on the description of faith

Abdullah bin Amr bin Hind al-Jamali (may Allah have mercy on him) said that Sayyiduna Ali (may Allah be pleased with him) said: Faith begins as a white dot in the heart. As faith increases, the whiteness also increases, until by the light of faith the believer's whole heart becomes white. Hypocrisy begins as a black dot in the heart. As hypocrisy increases, the blackness also increases, until the whole heart becomes black with the darkness of hypocrisy. By the One in whose hand is my soul, if you were to split open the heart of a believer and look, you would certainly find it white, and if you were to split open the heart of a hypocrite and look, you would certainly find it black.