Sayyiduna Awf bin Malik (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) came out with a staff in his hand. He saw some hanging clusters and struck them with the staff, and said: "It would not harm the owner of this wealth if he gave better than this in charity. The owner of these will eat poor-quality dates on the Day of Resurrection." Then he (peace and blessings be upon him) said: "By Allah, you will leave it, its fruit hanging low, abandoned for forty years to the 'awafi." He (peace and blessings be upon him) said: "Do you know what the 'awafi are?" They said: "Allahu wa rasuluhu a'lam (Allah and His Messenger know best)." He (peace and blessings be upon him) said: "It means birds and beasts of prey."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7527