Salim bin Abdullah narrates from his father, from the Prophet (peace and blessings be upon him), the story of the palm trees and of the slave together. Nafi' narrates the story of the palm trees from Ibn Umar (may Allah be pleased with them both) from the Prophet (peace and blessings be upon him), and the story of the slave from Ibn Umar (may Allah be pleased with them both) from Umar (may Allah be pleased with him).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10759