Sahih al-Bukhari 761
Sahih al-Bukhari · Book 10: Call to Prayers (Adhaan) · The recitation of the Qur'an in the 'Asr prayer
Narrated Abu Ma`mar:
حَدَّثَنَا مُحَمَّدُ بْنُ يُوسُفَ ، قَالَ حَدَّثَنَا سُفْيَانُ ، عَنِ الأَعْمَشِ ، عَنْ عُمَارَةَ بْنِ عُمَيْرٍ ، عَنْ أَبِي مَعْمَرٍ ، قَالَ قُلْتُ لِخَبَّابِ بْنِ الأَرَتِّ أَكَانَ النَّبِيُّ صلى الله عليه وسلم يَقْرَأُ فِي الظُّهْرِ وَالْعَصْرِ قَالَ نَعَمْ. قَالَ قُلْتُ بِأَىِّ شَىْءٍ كُنْتُمْ تَعْلَمُونَ قِرَاءَتَهُ قَالَ بِاضْطِرَابِ لِحْيَتِهِ.
I asked Khabbab bin Al-Art whether the Prophet (ﷺ) used to recite the Qur'an in the Zuhr and the `Asr prayers. He replied in the affirmative. I said, "How did you come to know that?" He replied, "From the movement of his beard."