The reason for success in every Ummah of the Prophets and Messengers
Imaam Abdul Azeez Bin Baaz (rahimahullaah) said:
Unity; oneness of purpose and truthful co-operation upon truth in every Ummah, is without a doubt the underlying reason for success, victory and nobility in this life and the next.
[Ash-Sharee-ah Al-Islaamiyyah Wa-Mahaasinuhaa. Page: 11]