حَدَّثَنَا سُفْيَانُ عَنْ عَاصِمٍ عَنْ أَبِي وَائِلٍ عَنْ عَبْدِ اللَّهِ قَالَ كُنَّا نُسَلِّمُ عَلَى النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا كُنَّا بِمَكَّةَ قَبْلَ أَنْ نَأْتِيَ أَرْضَ الْحَبَشَةِ فَلَمَّا قَدِمْنَا مِنْ أَرْضِ الْحَبَشَةِ أَتَيْنَاهُ فَسَلَّمْنَا عَلَيْهِ فَلَمْ يَرُدَّ فَأَخَذَنِي مَا قَرُبَ وَمَا بَعُدَ حَتَّى قَضَوْا الصَّلَاةَ فَسَأَلْتُهُ فَقَالَ إِنَّ اللَّهَ عَزَّ وَجَلَّ يُحْدِثُ فِي أَمْرِهِ مَا يَشَاءُ وَإِنَّهُ قَدْ أُحْدِثَ مِنْ أَمْرِهِ أَنْ لَا نَتَكَلَّمَ فِي الصَّلَاةِ
مسند امام احمد بن حنبل · Hadith 3575
It was narrated that 'Abdullah (RA) said: We used to greet the Prophet (PBUH) [when he was praying] when we were in Makkah before we went to Abyssinia. When we came from Abyssinia, we came to him and greeted him [when he was praying] but he did not return the greeting and I got very distressed and started trying to find out why, until they finished praying. I asked him and he said: "Allah introduces whatever He wants into His matter [i.e., religion] and He has decreed that we should not speak whilst praying."
Sanad
حَدَّثَنَا سُفْيَانُ عَنْ عَاصِمٍ عَنْ أَبِي وَائِلٍ عَنْ عَبْدِ اللَّهِ