The Book of Prayers (Kitab Al-Salat)
Muslim :: Book 4 : Hadith 1353
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 superetogatory prayer for you. Khalaf (one of the narrators in the above hadith) has not mentioned" beyond their (prescribed) time".
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