Imam Ja‘far al-Ṣadiq (as): A Muslim must not associate in a brotherly manner with an immoral person, for such a person tends to decorate one's evil deeds for him and likes to render him just as immoral as he is; he will not help him in his worldly affairs or that of his hereafter, and his socializing with him will only bring disgrace to him. al-Kāfī