Sayyiduna Ibn Abbas (may Allah be pleased with them both) said that the Messenger of Allah (peace and blessings be upon him) delivered a sermon so loud that even the secluded young maidens in their quarters heard it. He (peace and blessings be upon him) said: "O you who have accepted Islam with your tongues while faith has not entered your hearts! Do not harm the believers, and do not pursue their faults, for whoever pursues the fault of his brother, Allah will pursue his fault, and whoever's fault Allah pursues, He will disgrace him, even if he is in the depths of his own house."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11396