I would like to know the authenticity of the hadith that states "a fire will emerge from Aden Abyan."

The Hadith narrated by Imam Ahmad: "Twelve thousand will emerge from Aden Abyan, supporting Allah and His Messenger; they are the best between me and them," is an authentic Hadith. Imam Ahmad authenticated Al-Mundhir ibn Al-Nu'man, and the rest of its narrators are trustworthy, being narrators found in the collections of the Two Sheikhs (Bukhari and Muslim). It was also authenticated by Al-Haythami, Al-Busiri, Ahmad Shakir, and Al-Albani.