"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." (Using translation from Nasāʾī 1189)  

بَعَثَنِي رَسُولُ اللهِ ﷺ لِحَاجَةٍ ثُمَّ أَدْرَكْتُهُ وَهُوَ يُصَلِّي فَسَلَّمْتُ عَلَيْهِ فَأَشَارَ إِلَيَّ فَلَمَّا فَرَغَ دَعَانِي فَقَالَ «إِنَّكَ سَلَّمْتَ عَلَيَّ آنِفًا وَأَنَا أُصَلِّي» وَإِنَّمَا هُوَ مُوَجَّهٌ حِينَئِذٍ إِلَى الْمَشْرِقِ  

[Machine] The following passage is a Hadith from the Prophet Muhammed ﷺ : "Verily, there is diversion in prayer." It was contradicted by Bishr ibn al-Mufaddal.  

عَنْ رَسُولِ اللهِ ﷺ قَالَ «إِنَّ فِي الصَّلَاةِ شُغْلًا» خَالَفَهُ بِشْرُ بْنُ الْمُفَضَّلِ  

[Machine] About the Prophet ﷺ concerning a man who greeted him while he was praying, he said, "Indeed, in prayer there is occupation."  

عَنِ النَّبِيِّ ﷺ فِي الرَّجُلِ يُسَلِّمُ عَلَيْهِ وَهُوَ يُصَلِّي قَالَ «إِنَّ فِي الصَّلَاةِ شُغْلًا»  

[Machine] We used to greet the Messenger of Allah ﷺ while he was praying, and he would respond to us. But when we arrived in Habasha (Ethiopia) and returned, we greeted him and he did not respond. So we asked him, and he said, "Indeed, I was preoccupied in prayer."  

كُنَّا نُسَلِّمُ عَلَى رَسُولِ اللهِ ﷺ وَهُوَ يُصَلِّي فَيَرُدُّ عَلَيْنَا فَلَمَّا أَتَيْنَا الْحَبَشَ فَرَجَعْنَا فَسَلَّمْنَا عَلَيْهِ فَلَمْ يُرِدَّ فَسَأَلْنَاهُ فَقَالَ «إِنَّ فِي الصَّلَاةِ شُغْلًا»  

He greeted the Messenger of Allah ﷺ with the Salam when he was praying, and he returned the greeting. (Using translation from Nasāʾī 1188)  

أَنَّهُ «سَلِمَ عَلَى رَسُولِ اللهِ ﷺ وَهُوَ يُصَلِّي فَرَدَّ عَلَيْهِ»