When those who disbelieve had put in their hearts pride and haughtiness the pride and haughtiness of the time of ignorance , then Allah sent down His Sakinah ( calmness and tranquillity ) upon His Messenger ( SAW ) and upon the believers , and made them stick to the word of piety ( i.e. none has the right to be worshipped but Allah ) , and they were well entitled to it and worthy of it . And Allah is the All-Knower of everything .