Abd al-Aziz bin Qays says: I asked Sayyiduna Anas (may Allah be pleased with him) about the length of the recitation in the prayer of the Prophet (peace and blessings be upon him). He (may Allah be pleased with him) ordered al-Nadr bin Anas or one of his sons to lead us in the Zuhr or Asr prayer, and he recited 'By those sent forth' [Surah al-Mursalat: 1] and 'About what are they asking one another?' [Surah al-Naba': 1].
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 5283