It is narrated from Hazrat Mu'adh (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: Just as there is a wolf for sheep, similarly, for humans, Satan is a wolf who seizes the sheep that remains alone and separated from the flock. Therefore, protect yourselves from living alone in the valleys, and make it obligatory upon yourselves to stay with the congregation of Muslims, the public, and the mosque.