We were in the company of the Messenger of Allah ﷺ, and he sent me on an errand, and when I came back (I saw him) saying prayer on his ride and his face was not turned towards Qibla. I greeted him but he did not respond to me. As he completed the prayer, he said: Nothing prevented me from responding to your greeting but the fact that I was praying.
كُنَّا مَعَ النَّبِيِّ ﷺ فَبَعَثَنِي فِي حَاجَةٍ فَرَجَعْتُ وَهُوَ يُصَلِّي عَلَى رَاحِلَتِهِ وَوَجْهُهُ عَلَى غَيْرِ الْقِبْلَةِ فَسَلَّمْتُ عَلَيْهِ فَلَمْ يَرُدَّ عَلَىَّ فَلَمَّا انْصَرَفَ قَالَ إِنَّهُ لَمْ يَمْنَعْنِي أَنْ أَرُدَّ عَلَيْكَ إِلاَّ أَنِّي كُنْتُ أُصَلِّي