Abu Ma'mar (may Allah have mercy on him) narrates that we asked Khabbab (may Allah be pleased with him), "Did the Messenger of Allah (peace and blessings be upon him) recite (Qur'an) in the Zuhr and Asr prayers?" He replied, "Yes, he did." We asked, "How did you know (that he recited)?" He said, "We would know from the movement of his beard." The narrators of this hadith, Duraqi, Makhzumi, and Abu Kuraib, have narrated with the words "from the movement of his beard."