Musannaf Ibn Abi Shaybah 3609 — How much is recited in Zuhr

Sayyiduna Abu Qatadah (may Allah be pleased with him) said: The Prophet (peace and blessings be upon him) used to lead us in the first two rak'ahs of Zuhr reciting at length in the first rak'ah and briefly in the second. He led the Fajr prayer in the same way, reciting at length in the first rak'ah and briefly in the second. And he used to recite to us in the two rak'ahs of Asr.