How does the one who is praying return the salam to the one who greeted him?
Machine translationRead the Arabic original
The questioner : Let me let this questioner speak. He says: How do I return the salam to the one who greeted me while I am praying?
The Shaykh : Perhaps his prayer is invalidated, but it is not invalidated if he is ignorant. Welcome. But if he is a student of knowledge and knows the situation, and you greeted him, he returns it with a gesture. The evidence is that he was commanded to do so.
The Shaykh : Perhaps his prayer is invalidated, but it is not invalidated if he is ignorant. Welcome. But if he is a student of knowledge and knows the situation, and you greeted him, he returns it with a gesture. The evidence is that he was commanded to do so.
Source
دروس وفتاوى المسجد الحرام لعام 1406هـ - 11 — binothaimeen.net (15:32)
The Arabic text is a machine transcription of the audio recording.