The sins committed by people's mouths may be more grievous than the sins committed by their eyes. A person may commit Shirk (associating others with Allah in His Divinity or worship), which is the ever grievous sin whereby Allah is disobeyed, with the person's tongue. Moreover, one may also say with his tongue what he does not know with regard to Allah and other major sins. It was authentically reported that the Messenger of Allah (peace be upon him)
was asked about indulgence which will admit a man to Hell (Fire) and he answered: The tongue and the genitals.
Therefore, we come to know that the mouth is more grievous than the eye.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.