Musnad Ahmad 1152:1

Husayn narrated to us, Shayban narrated to us, al-Hasan ibn al-Hakam narrated to us, from Abdullah ibn Abis, from Farwah ibn Musayk, who said: I came to the Messenger of Allah, peace and blessings of Allah be upon him, and I heard a man saying: "O Messenger of Allah, is Saba a land or a woman?" He said: "It is neither a land nor a woman, but it is a man who had ten children from the Arabs. Four of them were considered ill-omened, and six were considered blessed. As for those who were considered ill-omened: they are Akk, Lakhm, Ghassan, and Amilah. As for those who were considered blessed: they are al-Azd, Kindah, Madh-hij, Himyar, the Ash'ariyyun, and Anmar." A man said: "O Messenger of Allah, and what is Anmar?" He said: "Those from whom are Khath'am and Bajilah."