Al-An'am 6:137

In ancient times, the people of Arabia used to attribute their religion to Abraham and Ishmael. But, in practice, the religion prevalent there was a self-made one, which their leaders had invented and introduced among them. The offering of their produce and cattle made in the name of God and His alleged partners were subject to strict restrictions of their own conception. For instance, if a freed animal was sacrificed and if a live offspring came out of its womb, then it was held that its meat could be eaten only by males and should not be eaten by females, whereas if the offspring was a dead one, it could be eaten by both males and females. Similarly, it was forbidden to ride on the back of certain animals or to place loads on them. In respect of some animals, it was their belief that God’s name should not be taken while riding, slaughtering or milking them. Such people are far removed from the real requirements of religion, i.e. the human being’s devotion to God and his concern about the Hereafter. Every day, they go beyond the limits fixed by God, but take care to strictly observe rules about irrelevant matters of minor importance. This is one of Satan’s complex strategies. He alienates people from the real religion by introducing unrelated matters among them in the name of religion. By creating a tendency to extremism in them, he instils the misunderstanding in man that he (the latter) is steadfast in God’s religion. Extremism in the outer formalities of prayers is the special product of this psychology. A man devoid of sincerity and humility pays meticulous attention to externals, imagining that he has performed the act of prayer to the utmost perfection.