Sayyiduna Farwah bin Musayk (may Allah be pleased with him) narrates: I came to the Messenger of Allah (peace and blessings be upon him) and said: O Messenger of Allah, shall I fight, with those of my people who have come forward (to Islam), those of them who have turned away? He (peace and blessings be upon him) said: "Yes." Then, when he was about to leave, he called him back and said: "First invite them to Islam; if they refuse, then fight them." I said: O Messenger of Allah, tell me about Saba: was it a man or a woman? He (peace and blessings be upon him) said: "He was a man of the Arabs who had ten sons. Six of them turned towards Yemen and four towards Sham. Those who turned towards Yemen were al-Azd, Kindah, Madhhij, the Ash'ariyyun, Himyar, and Anmar (from whom are Bajilah); and those who turned towards Sham were Amilah, Ghassan, Lakhm and Judham."
Hadith Referenceالمعجم الكبير للطبراني / باب الفاء / 15925