Rabi' ibn 'Amir (radhi Allah 'anh) upon entering the luxurious court of Rustum, the Commander-in-Chief of the Persian armies, was asked why the Bedouin Arabs, with their poor unsophisticated lifestyle and backward civilization, had left their tents in the desert and come to fight the great advanced civilization of Persia in their centres of military power, confidently replied:

"Allah has sent us to liberate His slaves (human beings) from servitude to other slaves into the servitude of the Master of the slaves. We come to liberate YOU from the narrowness of the dunya (world) into the vastnesss of the akhira (hereafter). We have come to free YOU from the oppression of the many multitudes of religions and ways of life into the justice ('adl) of the one true Deen of Islam!"