Musannaf Ibn Abi Shayba 13:3352

Abu Bakr narrated to us, he said: Hushaym narrated to us, from Mughira, from Ibrahim, who said: It was said to him: "Indeed, some of the slave traders and animal owners—one of them names the stable of his animals 'Khurasan' and 'Sijistan,' then he comes to the market and says, 'They have come from Khurasan and Sijistan.'" He said: Ibrahim disliked that.