It was narrated that Ibn 'Umar said:

"The Messenger of Allah ﷺ used to pray while on his animal when he was coming back from Makkah to Madinah. Concerning this, the verse was revealed: So wherever you turn (yourselves or your faces) there is the Face of Allah.'" [1]

[1] Al-Baqarah 2:115.

أَخْبَرَنَا عَمْرُو بْنُ عَلِيٍّ، وَمُحَمَّدُ بْنُ الْمُثَنَّى، عَنْ يَحْيَى، عَنْ عَبْدِ الْمَلِكِ، قَالَ حَدَّثَنَا سَعِيدُ بْنُ جُبَيْرٍ، عَنِ ابْنِ عُمَرَ، قَالَ كَانَ رَسُولُ اللَّهِ ﷺ يُصَلِّي عَلَى دَابَّتِهِ وَهُوَ مُقْبِلٌ مِنْ مَكَّةَ إِلَى الْمَدِينَةِ وَفِيهِ أُنْزِلَتْ { فَأَيْنَمَا تُوَلُّوا فَثَمَّ وَجْهُ اللَّهِ } .