Instead , Muhammad married her off to his stepson , Salama ibn Abi Salama .
Muhammad replied that this would be impossible ; since Hamza had been his foster - brother , Umama was counted as his niece .
Muhammad married Umama off to Muhammad 's stepson , Salama ibn Abi Salama .
Muhammad replied that this would be impossible ; since Hamza had been his foster - brother , Umama was counted as his niece .