Allah buys from the Believers their Wealth and their Selves
The Believers Struggle in the Path of Allah - fighting the enemies of Allah and enemies of Islam - the tyrants, oppressors, the idol worshippers
He pays them with Eternal Reward of Paradise

This is a promise stated in the Torah, Gospel, and Quran

Why is that God has to `buy' something? This is a clever Quranic verse which implies that you as a human, can refuse to `sell' something that you love, can't you? If you love youself so much, would you `sell' - would you be willing to fight and die for Allah? Your death is not wasted, because God Himself will pay you with Paradise

A Muslim is not really a firm Believer until he or she loves and cares for another Muslim like oneself (If he or she doesn't care, or hates others for no reason, or refuse to help and assist)

*Difference in ethnicity, language, geography, skin color is no barrier - we Muslims in Asia love and care for our Muslim brothers in Africa, Arabs, Europe, USA, anywhere