Al-Harith bin Bilal bin al-Harith (may Allah be pleased with him) narrates from his father that the Messenger of Allah (peace and blessings be upon him) collected zakah from the mines of al-Qabaliyyah, and he (peace and blessings be upon him) granted the area of al-Aqiq to Bilal bin al-Harith (may Allah be pleased with him). When (the time of) Umar bin al-Khattab (may Allah be pleased with him) came, he said to Bilal (may Allah be pleased with him): The Messenger of Allah (peace and blessings be upon him) granted you this plot only so that you would work it. Then Umar bin al-Khattab (may Allah be pleased with him) distributed the plot of al-Aqiq among the people.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7637