We were accompanying the Prophet ﷺ on a journey and I was riding an unmanageable camel belonging to 'Umar (ra), and I could not bring it under my control. So, it used to go ahead of the party and 'Umar would check it and force it to retreat, and again it went ahead and again 'Umar forced it to retreat. The Prophet ﷺ asked 'Umar to sell that camel to him. 'Umar replied, "It is for you O Messenger of Allah !" Messenger of Allah ﷺ told 'Umar to sell that camel to him (not to give it as gift). So, 'Umar sold it to Messenger of Allah ﷺ. Then the Prophet ﷺ said to 'Abdullah bin 'Umar "This camel is for you O 'Abdullah (as a present) and you could do with it whatever you like."  

كُنَّا مَعَ النَّبِيِّ ﷺ فِي سَفَرٍ فَكُنْتُ عَلَى بَكْرٍ صَعْبٍ لِعُمَرَ فَكَانَ يَغْلِبُنِي فَيَتَقَدَّمُ أَمَامَ الْقَوْمِ فَيَزْجُرُهُ عُمَرُ وَيَرُدُّهُ ثُمَّ يَتَقَدَّمُ فَيَزْجُرُهُ عُمَرُ وَيَرُدُّهُ فَقَالَ النَّبِيُّ ﷺ لِعُمَرَ بِعْنِيهِ قَالَ هُوَ لَكَ يَا رَسُولَ اللَّهِ قَالَ بِعْنِيهِ فَبَاعَهُ مِنْ رَسُولِ اللَّهِ ﷺ فَقَالَ النَّبِيُّ ﷺ هُوَ لَكَ يَا عَبْدَ اللَّهِ بْنَ عُمَرَ تَصْنَعُ بِهِ مَا شِئْتَ  

I bartered my property in Khaibar to 'Uthman (chief of the faithful believers) for his property in Al-Wadi. When we finished the deal, I left immediately and got out of his house lest he should cancel the deal, for the tradition was that they buyer and the seller had the option of canceling the bargain unless they separated. When out deal was completed, I came to know that I have been unfair to 'Uthman, for by selling him my land I caused him to be in a land of Thamud, at a distance of three days journey from Al-Madina, while he made me neared to Al-Madina, at a distance of three days journey from my former land.  

بِعْتُ مِنْ أَمِيرِ الْمُؤْمِنِينَ عُثْمَانَ مَالاً بِالْوَادِي بِمَالٍ لَهُ بِخَيْبَرَ فَلَمَّا تَبَايَعْنَا رَجَعْتُ عَلَى عَقِبِي حَتَّى خَرَجْتُ مِنْ بَيْتِهِ خَشْيَةَ أَنْ يُرَادَّنِي الْبَيْعَ وَكَانَتِ السُّنَّةُ أَنَّ الْمُتَبَايِعَيْنِ بِالْخِيَارِ حَتَّى يَتَفَرَّقَا قَالَ عَبْدُ اللَّهِ فَلَمَّا وَجَبَ بَيْعِي وَبَيْعُهُ رَأَيْتُ أَنِّي قَدْ غَبَنْتُهُ بِأَنِّي سُقْتُهُ إِلَى أَرْضِ ثَمُودٍ بِثَلاَثِ لَيَالٍ وَسَاقَنِي إِلَى الْمَدِينَةِ بِثَلاَثِ لَيَالٍ