Yahya ibn Sa'id narrated that a man asked Sa'id ibn al-Musayyib (may Allah have mercy on him): "I perform prayer in my house, then I come to the mosque and find the imam praying. Should I pray with him again?" Sa'id ibn al-Musayyib (may Allah have mercy on him) said: "Yes." The man then asked: "Which of the two prayers should I consider as obligatory?" Sa'id ibn al-Musayyib (may Allah have mercy on him) said: "Can you distinguish between obligatory and supererogatory prayers? This matter belongs to Allah, Glorified and Exalted is He."
Hadith Referenceموطا امام مالك رواية يحييٰ / كتاب صلاة الجماعة / 297
Hadith Gradingمحدثین:مقطوع صحيح
Hadith Takhrij«مقطوع صحيح، وأخرجه عبد الرزاق فى «مصنفه» برقم: 3938، والبيهقي فى«سننه الكبير» برقم: 3710، والبيهقي فى «معرفة السنن والآثار» برقم:135/2، شركة الحروف نمبر: 279، فواد عبدالباقي نمبر: 8 - كِتَابُ صَلَاةِ الْجَمَاعَةِ-ح: 10»