Sahih al-Bukhari, Hadith 761 ⓘ
Narrated Abu Ma`mar: I asked Khabbab bin Al-Art whether the Prophet 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."
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.
also referenced under: Book 10, Hadith 155 (In-Book) & Volume 1, Book 12, Hadith 728 (USC-MSA)