Ан-Ниса 4:95

Muslims broadly fall into two categories as far the level of their actions is concerned. One category is comprised of those who adopt the Islamic way of life, remaining within the confines of obligatory injunctions. They worship God and live discreetly, heeding what is lawful and what is unlawful. The second category includes those who live at the level of sacrifice. They follow Islam and exert themselves to convey its message to other people, willingly enduring the difficulties of their endeavour. They place their lives and prossessions in jeopardy for the cause of Islam. They do not confine themselves to obeying obligatory injunctions, but move far beyond—offering their very existence for the sake of Islam. Muslims in both the categories are sincere and will be recipients of their respective shares of God’s grace; however, the status of the second category of Muslims is different from the first. Their offerings in the path of God were not in measurable terms, so neither will God’s requital of their efforts be measurable. These Muslims joined the mission of God without any consideration for expediency; accordingly, God’s grace and mercy will, in return, be immeasurable.