My friend (the Holy Prophet) bade me to hear and obey (the ruler) even if he is a slave having his feet and arms cut off, and observe prayer at its prescribed time. (And further said): It you find people having observed the prayer, you in fact saved your prayer, otherwise (if you join with them) that would be a Nafl prayer for you.
Reference: Sahih Muslim 648 c In-book : Book 5, Hadith 303 USC-MSA web (English) : Book 4, Hadith 1355 (deprecated)
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