Sahih al-Bukhari · Hadith 777

Call to Prayers (Adhaan)
777

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