It is narrated from Sayyiduna Utbah bin Abd (may Allah be pleased with him) that a man said: O Messenger of Allah, curse the people of Yemen, for they are very mighty, great in number, and possessors of strong fortresses. He (peace and blessings be upon him) said: "No." And the Messenger of Allah (peace and blessings be upon him) cursed the two non-Arab nations, Persia and Rome. And the Messenger of Allah (peace and blessings be upon him) said: "When the people of Yemen pass by you, driving their women along and carrying their sons on their shoulders, then know that they are from me and I am from them."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14376