Abdallah b. Mas'ud said:Before we went to Abyssinia we used to greet God’s Messenger when he was engaged in prayer and he would respond to us, but when we returned from Abyssinia I came to him and found him praying. I greeted him and he did not respond to me, but when he finished his prayer he said, “God creates new commands as He wishes, and one of them is that you must not talk during prayer.”
Hadith Referenceمشكوة المصابيح / كتاب الصلاة / 989
Hadith Gradingالألبانی:حسن | زبیر علی زئی:إسناده حسن
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «إسناده حسن، رواه أبو داود (924)»