Sahih Bukhari Volume 3, Book 34, Hadith 2116

وَقَالَ الْحُمَيْدِيُّ حَدَّثَنَا سُفْيَانُ، حَدَّثَنَا عَمْرٌو، عَنِ ابْنِ عُمَرَ ـ رضى الله عنهما ـ قَالَ كُنَّا مَعَ النَّبِيِّ صلى الله عليه وسلم فِي سَفَرٍ فَكُنْتُ عَلَى بَكْرٍ صَعْبٍ لِعُمَرَ، فَكَانَ يَغْلِبُنِي فَيَتَقَدَّمُ أَمَامَ الْقَوْمِ، فَيَزْجُرُهُ عُمَرُ وَيَرُدُّهُ، ثُمَّ يَتَقَدَّمُ فَيَزْجُرُهُ عُمَرُ وَيَرُدُّهُ فَقَالَ النَّبِيُّ صلى الله عليه وسلم لِعُمَرَ ‏"‏ بِعْنِيهِ ‏"‏‏.‏ قَالَ هُوَ لَكَ يَا رَسُولَ اللَّهِ‏.‏ قَالَ ‏"‏ بِعْنِيهِ ‏"‏‏.‏ فَبَاعَهُ مِنْ رَسُولِ اللَّهِ صلى الله عليه وسلم فَقَالَ النَّبِيُّ صلى الله عليه وسلم ‏"‏ هُوَ لَكَ يَا عَبْدَ اللَّهِ بْنَ عُمَرَ تَصْنَعُ بِهِ مَا شِئْتَ ‏"‏‏.‏

Narrated Ibn Umar:We were accompanying the prophet(s.a.w.) on a journy and I was riding an unmanageablecamel belonging to Umar, 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 to retreat.The Prophet(s.a.w.) asked Umar to sell that camel to him.Umar replied,"It is for you O Allah's Apostle!" Allah's Apostle told Umar to sell that camel to him(not to give it as a gift).So,Umar sold it to Allah's Apostle(s.a.w).Then Prophet (s.a.w.)said to Abdullah bin Umar,"The camel is for you O Abdullah(as a present) and you could do with it whatever you like."