Muwatta Malik 411

Arabic

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، أَنَّهُ قَالَ مَا صَلاَةٌ يُجْلَسُ فِي كُلِّ رَكْعَةٍ مِنْهَا ثُمَّ قَالَ سَعِيدٌ هِيَ الْمَغْرِبُ إِذَا فَاتَتْكَ مِنْهَا رَكْعَةٌ وَكَذَلِكَ سُنَّةُ الصَّلاَةِ كُلُّهَا ‏.‏

Translation

Yahya related to me from Malik from Ibn Shihab that Said ibn al- Musayyab said, "Which prayer is it when you remain in the sitting position in every raka?'' Said said, "It is maghrib when you miss one raka, and that is the sunna in all the prayers

Authenticity

Sahih · Salim al-Hilali

Reference