Sunan Abi Dawud Book 2, Hadith 411

We asked Khabbab: Did the Messenger of Allah (ﷺ) recit (the Quran) in the noon and afternoon prayers? He replied: Yes. We then asked: How did you know this? He said: By the shaking of his beard, may peace be upon him.

Previous Hadith

We thought that by this (prolonging the first rak’ah). He (the prophet) meant that the people might join the first rak’ah.

Sunan Abi Dawud Book 2, Hadith 410
Next Hadith

The prophet (ﷺ) used to stand in the rak’ah of prayer so much so that no sound of steps heard.

Sunan Abi Dawud Book 2, Hadith 412