Al Salamu 'Alaykum.
Allah says in Sura Aal-e-'Imraan, ayat 103-105:
"And hold fast, all together by the rope which Allah (stretches out for you), and be not divided among yourselves; and remember with gratitude Allah's favour on you; for ye were enemies and He joined your hearts in love so that by His Grace, ye became brethren; and ye were on the brink of the pit of fire, and He saved you from it. Thus doth Allah make his signs clear to you: that ye may be guided. Let there arise out of you a band of people inviting to all that is good, enjoining what is right, and forbidding what is wrong; they are the ones to attain felicity. Be not like those who are divided amongst themselves and fall into disputations after receiving Clear signs; for them is a dreadful penalty." (Abdullah Yusuf 'Ali).
And yet there are no signs of the Ummah uniting. Alas.
"Yun to Sayyid bhi ho, Mirza bhi ho, Afghan bhi ho,
Sabhi kuch ho, batao to Musalman bhi ho?"