question #3 Sahih al-Bukhari 761, Book 10, Hadith 155 : What methods were used by the companions to observe and learn about the Prophet’s (ﷺ) practices in prayer?

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.”