Narrated Ibn 'Umar:

That he was in the company of the Prophet on a journey, riding a troublesome camel belonging to 'Umar. The camel used to go ahead of the Prophet, so Ibn 'Umar's father would say, "O 'Abdullah! No one should go ahead of the Prophet." The Prophet ﷺ said to him, "Sell it to me." 'Umar said to the Prophet "It is for you." So, he bought it and said, "O 'Abdullah! It is for you, and you can do with it what you like."

وَقَالَ الْحُمَيْدِيُّ حَدَّثَنَا سُفْيَانُ، حَدَّثَنَا عَمْرٌو، عَنِ ابْنِ عُمَرَ ـ رضى الله عنهما ـ قَالَ كُنَّا مَعَ النَّبِيِّ ﷺ فِي سَفَرٍ، وَكُنْتُ عَلَى بَكْرٍ صَعْبٍ فَقَالَ النَّبِيُّ ﷺ لِعُمَرَ " بِعْنِيهِ ". فَابْتَاعَهُ فَقَالَ النَّبِيُّ ﷺ " هُوَ لَكَ يَا عَبْدَ اللَّهِ ".