(7) باب تَحْرِيمِ الْكَلاَمِ فِي الصَّلاَةِ وَنَسْخِ مَا كَانَ مِنْ إِبَاحَتِهِ
Jabir reported:
The Messenger of Allah (ﷺ) sent me on an errand. I (having done the business assigned to me came back and) joined him as he was going (on a ride). Qutaiba said that he was saying prayer while he rode. I greeted him. He gestured to me. When he completed the prayer. he called me and said: You greeted me just now while I was engaged in prayer. (Qutaiba said): His (Prophet's face) was towards the east, as he was praying.
Reference: Sahih Muslim 540 a
In-book reference: Book 5, Hadith 45
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1100