Ibn Umar (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) ascended the pulpit and proclaimed loudly: "O people! Those of you who have accepted Islam with your tongues while faith has not yet entered your hearts, do not harm the Muslims, nor disgrace them, nor seek out their faults. For whoever seeks out the faults of his (Muslim) brother, Allah will pursue his faults, and whoever's faults Allah pursues, He will disgrace him even if he is in the midst of his house." Its chain is Hasan. Narrated by al-Tirmidhi.