حَدَّثَنَا عَبْدُ الرَّزَّاقِ أَخْبَرَنَا سُفْيَانُ عَنِ الْأَعْمَشِ عَنْ إِبْرَاهِيمَ قَالَ قَالَ عَبْدُ اللَّهِ كُنَّا نُسَلِّمُ عَلَى النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فِي الصَّلَاةِ حَتَّى رَجَعْنَا مِنْ عِنْدِ النَّجَاشِيِّ فَسَلَّمْنَا عَلَيْهِ فَلَمْ يَرُدَّ عَلَيْنَا وَقَالَ إِنَّ فِي الصَّلَاةِ شُغْلًا
مسند امام احمد بن حنبل · Hadith 3884
It was narrated that Ibraheem said: 'Abdullah (RA) said: We used to greet the Messenger of Allah (PBUH) with salam when he was praying (and he would return our greeting), until we came back from being with the Negus; we greeted him with salam (whilst he was praying) and he did not return the greeting. And he said: "There is sufficient preoccupation in the prayer.”
Sanad
حَدَّثَنَا عَبْدُ الرَّزَّاقِ أَخْبَرَنَا سُفْيَانُ عَنِ الْأَعْمَشِ عَنْ إِبْرَاهِيمَ قَالَ قَالَ عَبْدُ اللَّهِ