Аль-Джасия 45:20

According to verse 16, God exalted the Children of Israel over the peoples of the world. This parallels what was said of the people (ummah) of the Prophet Muhammad, i.e. ‘You are the best ummah (nation)’ ( 3:110 ). To make a group the bearer of the Book of God is in fact making it responsible for guidance to other nations’ and it is in this sense that the community that bears the Book is superior to all nations. In principle, the Children of Israel were commanded to convey the message to the whole world, as is now the case with the Muslims. But the Children of Israel, by introducing deviations into their Book, lost this status forever. There is always uniformity in the authentic teachings of religion. But additions to them by scholars create differences and undue complexities. Then every scholar makes additions according to his taste. Thereafter every scholar and his followers set about proving their additions to be correct and others’ additions to be incorrect. In this way, religious sects start forming and finally a stage is reached when one religion becomes divided into several religions. When the Children of Israel distorted their revealed religion, God thereupon revealed the Quran through the Prophet Muhammad. Since no other prophet was to appear after him, God caused the Quran to be preserved and kept safe by special arrangements, so that it should never again happen that the religion of God be lost in the labyrinth of human additions.