Sayyiduna Ibn Umar (may Allah be pleased with him) said: We were with the Prophet (peace and blessings be upon him) on a journey, and I was riding a young, unruly camel belonging to Umar (may Allah be pleased with him). It would overpower me and go ahead of all the people, and Sayyiduna Umar (may Allah be pleased with him) would bring it back behind. The Prophet (peace and blessings be upon him) said to Sayyiduna Umar (may Allah be pleased with him): "Sell it to me." Umar (may Allah be pleased with him) said: "O Messenger of Allah, it is yours." He (peace and blessings be upon him) said: "Sell it to me." So Umar (may Allah be pleased with him) sold it to the Messenger of Allah (peace and blessings be upon him), and the Messenger of Allah (peace and blessings be upon him) said: "O Abdullah, it is yours; do with it whatever you wish."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الهبات / 11955