It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that once the Prophet (peace and blessings be upon him) came to his companions and they were expressing their opinions about that tree which rises from the surface of the earth and does not remain fixed. Some people said, "In our opinion, it is the mushroom." The Holy Prophet (peace and blessings be upon him) said, "The mushroom is a part of manna (which was sent down upon the Children of Israel), and its water is a cure for the eyes. And the Ajwa date is a date from Paradise, and it is a cure for poison."