Be fellow brothers and slaves of Allah
Abu Hurairah [may Allah be pleased with him) narrated that the Messenger of Allah (peace and blessings of Allah be upon him) said:
“Avoid jealousy between yourselves, do not outbid one another (with a view to raising the price), do not harbor hatred against one another, do not bear enmity against one another, one of you should not enter into a commercial transaction when the other has already entered into it; and be fellow brothers and slaves of Allah. A Muslim is a Muslim’s brother. He does not wrong, or let him down or despise him. Piety is found here (pointing three times to his chest), despising his Muslim brother is enough evil for any man to do. Every Muslim’s blood, property and honor are unlawful to be violated by another Muslim.”
compiled by Muslim. Al-Bukhari compiled parts of it with some chains of narrators ending with Abu Hurairah, see fath Albari 10/481, 484 and 492
Islam is built on the brotherhood of faith that brought together people of different races and environments regardless of their genealogy, their numbers, scientific degrees, money or positions.
Allah says (interpretation of the meaning):
"the believers are but brothers"
Quran (49:10)
they are brothers with all the related meanings of the word.
The religious-based brotherhood is one of the greatest blessings, it helps the Muslims to be interdependent and to live in peace and harmony. Moreover, Muslims will be victorious on their enemies because this concept itself is a force. Once the faith settles in the hearts, hatreds fade away, souls harmonize, brothers meet on one goal, one opinion, one word, they surely will be happy with these blessed brotherhood in this world and in the Hereafter. All the evil forces will fail to harm them, there is no more beneficial concept than the brotherhood of Islam.