All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah and that Muhammad, sallallaahu ʻalayhi wa sallam, is His slave and Messenger.
Ibn ʻAbbaas reported that the Prophet, sallallaahu ʻalayhi wa sallam, said, “Out of Aden-Abyan will come 12,000, giving victory to the (religion of) Allaah and His Messenger. They are the best between me and them.” [Ahmad - Al-Albaani graded it saheeh (sound)]
Aden-Abyan is a region in Yemen named after a man called Abyan. Al-Mulla ʻAli Qaari wrote, “Abyan is originally the name of a man to whom Aden is attributed. It was also said Aden Abyan is a village near the sea in the direction of Yemen. It was also said that Abyan is another name for the city of Aden in Yemen...” [Sharh Mishkaat Al-Masabeeh 7/2901]
The hadeeth refers to the events of the end of time and underlines the merits of the people of Aden. It also sheds light on the virtue of this army that will rise up from Aden, and this entails being true adherents of the Sunnah of the Prophet, sallallaahu ʻalayhi wa sallam, following his example and that of his Companions.
Allaah knows best.