Mukhtasar Muslim

It is narrated from Sayyiduna Abu Sa'id Khudri, may Allah be pleased with him, that the Noble Prophet, peace and blessings be upon him, used to recite in the first two rak'ahs of Zuhr, in each rak'ah, the equivalent of thirty verses, and in the last two rak'ahs, the equivalent of fifteen verses, or he said, half of that. And in the first two rak'ahs of 'Asr, in each rak'ah, the equivalent of fifteen verses, and in the last two rak'ahs, half of that (he used to recite).