Hazrat Hudhail bin Bilal narrates that I was with Muhammad bin Sirin when a man came to him and said, "I have a slave whom I want to sell. I have been offered six hundred dirhams for him, and the Khawarij have offered me eight hundred dirhams. Should I sell him to them?" He (Muhammad bin Sirin) asked, "Would you sell that slave to a Jew or a Christian?" I said, "No." He said, "Then do not sell to them either."