(108) باب مَنْ خَافَتَ الْقِرَاءَةَ فِي الظُّهْرِ وَالْعَصْرِ
Narrated Abu Ma`mar:
We said to Khabbab "Did Allah's Messenger (ﷺ) used to recite in Zuhr and `Asr prayers?" He replied in the affirmative. We said, "How did you come to know about it?" He said, "By the movement of his beard."
Reference: Sahih al-Bukhari 777
In-book reference: Book 10, Hadith 172
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 12, Hadith 744