Sahih Ibn Khuzaymah

It is permissible to recite more than Surah Al-Fatihah in the last two rak'ahs of Dhuhr and Asr prayers, and this difference is of the type of permissible differences. This is not a difference where one thing is forbidden and impermissible while the other is permissible and allowed. Therefore, it is permissible to suffice with only the recitation of Surah Al-Fatihah in each of the last two rak'ahs, and it is also permissible to recite more than Surah Al-Fatihah in the last two rak'ahs.

Sayyiduna Abu Sa'id Khudri رضي الله عنه narrates that we used to estimate the standing (qiyam) of the Messenger of Allah صلى الله عليه وسلم in the first two rak'ahs of Zuhr to be equal to the recitation of « الم ، تَنزِيلُ الْكِتَابِ » [ سورۃ السجدہ ], the recitation of thirty verses. He says: And in the last two rak'ahs, we used to estimate his standing to be half of that (recitation). He says: And in the first two rak'ahs of Asr, we used to estimate his standing to be half of that (recitation of verses). These are the words of the hadith of Ziyad bin Ayyub.