Umar ibn Khattab رضي الله عنه said "Do not speak about that which does not concern you, Know your enemy and be wary of your friend except for the trustworthy one. No one is trustworthy, except for the person who fears Allāh. Do not walk with the evildoer, lest he teaches you some of his wickedness; and do not reveal your secrets to him, and When you consult others in your affairs, consult only those who fear Allāh." [صفات الصفوة جلد رقم ١، صحفة ١٤٩]