"The Messenger of Allah (ﷺ) sent me on an errand then I came back to him while he was praying. I greeted him with the salam and he gestured to me. When he finished he called me and said: 'You greeted me with Salam just now and I was praying.' And he was facing toward the east that day."
Sunan an-Nasa'i Book 13, Hadith 11
← Previous Hadith He greeted the Messenger of Allah (ﷺ) with the Salam when he was praying, and he returned the greeting.

Sunan an-Nasa'i Book 13, Hadith 10 Next Hadith → "The Messenger of Allah (ﷺ) sent me on an errand, then I came back to him while he was facing the east or the west. I greeted him with salam and he gestured to me. Then when he finished he called me and said: "O Jabir!" So I came and said: "O Messenger of Allah, I greeted you with Salam but you did not answer." He said: 'I was praying.'

Sunan an-Nasa'i Book 13, Hadith 12