[Machine] We used to greet the Prophet ﷺ during prayer, and he would reply to us. But one day, I greeted him and he didn't reply to me. So, I asked him about it, and he said, "Allah ﷻ does as He wishes in His affairs."
كُنَّا نُسَلِّمُ عَلَى النَّبِيِّ ﷺ فِي الصَّلَاةِ فَيَرُدُّ عَلَيْنَا فَلَمَّا كَانَ ذَاتَ يَوْمٍ سَلَّمْتُ عَلَيْهِ فَلَمْ يَرُدَّ عَلَيَّ فَسَأَلْتُهُ عَنْ ذَلِكَ فَقَالَ «إِنَّ اللهَ ﷻ يُحْدِثُ مِنْ أَمْرِهِ مَا شَاءَ»
I used to greet the Prophet ﷺ while he was in prayer and he would return my greeting, but when we returned (from Ethiopia) I greeted the Prophet (while he was praying) but he did not return the greeting, and (after finishing the prayer) he said, "In the prayer one is occupied (with a more serious matter)."
كُنْتُ أُسَلِّمُ عَلَى النَّبِيِّ ﷺ وَهُوَ فِي الصَّلاَةِ فَيَرُدُّ عَلَىَّ فَلَمَّا رَجَعْنَا سَلَّمْتُ عَلَيْهِ فَلَمْ يَرُدَّ عَلَىَّ وَقَالَ إِنَّ فِي الصَّلاَةِ شُغْلاً
[Machine] "I used to greet the Messenger of Allah ﷺ during the prayer, and he would reply to me. But one day, when I greeted him, he did not reply to me. I felt something in myself, so when he finished, I said, 'O Messenger of Allah, when I greet you during the prayer, you reply to me. Why did you not reply to me?' He said, 'Verily, Allah Almighty does what He wills in His affairs.'"
كُنْتُ أُسَلِّمُ عَلَى رَسُولِ اللهِ ﷺ فِي الصَّلَاةِ فَيَرُدُّ عَلَيَّ فَلَمَّا كَانَ ذَاتَ يَوْمٍ سَلَّمْتُ عَلَيْهِ فَلَمْ يَرُدَّ عَلَيَّ فَوَجَدْتُ فِي نَفْسِي فَلَمَّا فَرَغَ قُلْتُ يَا رَسُولَ اللهِ إِنِّي إِذَا كُنْتُ سَلَّمْتُ عَلَيْكَ فِي الصَّلَاةِ رَدَدْتَ عَلَيَّ؟ قَالَ فَقَالَ إِنَّ اللهَ ﷻ يُحْدِثُ فِي أَمْرِهِ مَا يَشَاءُ