Abdullah bin Buraydah (may Allah have mercy on him) narrates from his father (Sayyiduna Buraydah, may Allah be pleased with him) that when Sayyiduna Salman (may Allah be pleased with him) came to Madinah, he placed a gift on a platter before the Messenger of Allah (peace and blessings be upon him). He (peace and blessings be upon him) asked: "Salman, what is this?" He said: "It is charity (sadaqah) for you (peace and blessings be upon him) and your Companions (may Allah be pleased with them)." He (peace and blessings be upon him) said: "I do not eat charity." So he took it away. The next day he again placed something on a platter in the same way, and he (peace and blessings be upon him) asked: "What is this?" He said: "This is a gift for you (peace and blessings be upon him)." The Messenger of Allah (peace and blessings be upon him) said to his Companions (may Allah be pleased with them): "Eat." He (peace and blessings be upon him) asked: "To whom do you belong?" He said: I am the slave of a people. He (peace and blessings be upon him) said: "Ask them to make a contract of manumission (mukatabah) with you." He says: They made a contract with me that I would plant such-and-such a number of date palms for them, and that Salman would tend them until they bore fruit. They did so, and the Prophet (peace and blessings be upon him) planted all the palms except one, which Sayyiduna Umar (may Allah be pleased with him) planted. All the palms bore fruit within the year except that palm. The Messenger of Allah (peace and blessings be upon him) asked: "Who planted this?" They said: Sayyiduna Umar (may Allah be pleased with him). So he (peace and blessings be upon him) planted it again with his own blessed hand, and it too bore fruit that same year.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب المكاتب / 21625