Chapter 13: The Book of Forgetfulness (In Prayer)
It was narrated that Zaid bin Aslam said: "Ibn 'Umar said:
The Prophet (ﷺ) entered the Masjid of Quba' to pray there, then some men came in and greeted him with Salam. I asked Suhaib, who was with him: 'What did the Messenger of Allah (ﷺ) do when he was greeted?' He said: 'He used to gesture with his hand.'"
Sunan an-Nasa'i 1187