Allies Allah

Ali said (to the people of 'Iraq), "Judge as you used to judge, for I hate differences (and I do my best ) till the people unite as one group, or I die as my companions have died."

He who takes anyone as his ally without the consent of his previous master, there will be the curse of Allah and that of His angels upon him, and neither, any obligatory act of his nor the supererogat...

There is no alliance (hilf) in Islam but (the hilf) established in the pre-Islamic days (for good). Islam intensifies and strengthens it.