Sunan Ibn Majah Book 5, Hadith 828

حَدَّثَنَا يَحْيَى بْنُ حَكِيمٍ، حَدَّثَنَا أَبُو دَاوُدَ الطَّيَالِسِيُّ، حَدَّثَنَا الْمَسْعُودِيُّ، حَدَّثَنَا زَيْدٌ الْعَمِّيُّ، عَنْ أَبِي نَضْرَةَ، عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ، قَالَ اجْتَمَعَ ثَلاَثُونَ بَدْرِيًّا مِنْ أَصْحَابِ رَسُولِ اللَّهِ ـ صلى الله عليه وسلم ـ فَقَالُوا تَعَالَوْا حَتَّى نَقِيسَ قِرَاءَةَ رَسُولِ اللَّهِ ـ صلى الله عليه وسلم ـ فِيمَا لَمْ يَجْهَرْ فِيهِ مِنَ الصَّلاَةِ ‏.‏ فَمَا اخْتَلَفَ مِنْهُمْ رَجُلاَنِ فَقَاسُوا قِرَاءَتَهُ فِي الرَّكْعَةِ الأُولَى مِنَ الظُّهْرِ بِقَدْرِ ثَلاَثِينَ آيَةً وَفِي الرَّكْعَةِ الأُخْرَى قَدْرَ النِّصْفِ مِنْ ذَلِكَ وَقَاسُوا ذَلِكَ فِي صَلاَةِ الْعَصْرِ عَلَى قَدْرِ النِّصْفِ مِنَ الرَّكْعَتَيْنِ الأُخْرَيَيْنِ مِنَ الظُّهْرِ ‏.‏

It was narrated that Abu Sa’eed Al-Khudri said:“Thirty of the Companions of the Messenger of Allah (ﷺ) who had been at Badr came together and said: ‘Come, let us estimate the length of the recitation of the Messenger of Allah (ﷺ) for the prayer in which Qur’an is not recited out aloud.’ No two men among them disagreed, and they estimated the length of his recitation in the first Rak’ah of the Zuhr to be thirty Verses and in the second Rak’ah to be half of that. They estimated his recitation in ‘Asr to be half of the last two Rak’ah of Zuhr.”