It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) said: "I know of a tree from which benefit is derived, and it is like a Muslim, and its leaves do not fall." I wanted to say that it is the date-palm tree, but then I was afraid of Sayyiduna Umar (may Allah be pleased with him). Later, I heard the Prophet (peace and blessings be upon him) say that it is the date-palm tree.