Abu Dharr reported: The Messenger of Allah (may peace be upon him) said to me: How would you act when you are under the rulers who would delay the prayer beyond its prescribed time, or they would make prayer a dead thing as far as its proper time is concerned? I said: What do you command? He (the Holy Prophet) said: Observe the prayer at Its proper time, and if you can say it along with them do so, for it would be a supererogatory prayer for you. Khalaf (one of the narrators in the above Hadith) has not mentioned “beyond their (prescribed) time”.
Chapter : Desirability of observing the morning prayer at earlier hour and that is the time when there is darkness before dawn and the exposition about the length of recitation in it.