Imam Jafar says : Thirteen (Tamim says 16) people are from the ummah of my grand father such people who neither love us, nor tell anyone to love us , rather they hate us, don’t keep us close, and keep distance from us and tell the people to keep distance from us. Hence they are our enemies and hell fire is for them.
The narrators says : I asked him to describe them. He said
5. The one who is black. Hence you will not see a person from the creation of God , whose color is black but that he calls us names and praises our enemies.
Khisal, p. 303, Shaikh Sadooq