It is narrated from Hazrat Muhammad bin Shihab that he says Hazrat Umar (may Allah be pleased with him) said: Do not involve yourselves in matters that do not concern you. And keep away from your enemy. And among your friends, choose only the trustworthy one as special. For among people, there is nothing like a trustworthy person. And do not keep the company of a wicked person, for he will teach you his wickedness. And do not disclose your secrets to him. And in your affairs, consult those who fear Allah Almighty.