(6) باب رَدِّ السَّلاَمِ بِالإِشَارَةِ فِي الصَّلاَةِ
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.'"
Reference: Sunan an-Nasa'i 1187
In-book reference: Book 13, Hadith 9
English translation: Vol. 2, Book 13, Hadith 1188