Sayyiduna Abu Hurayrah (may Allah be pleased with him) says that the Messenger of Allah (peace and blessings be upon him) sent Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) to collect zakah, and Ibn Jamil, Khalid bin al-Walid and Abbas (may Allah be pleased with them) refused to pay zakah. The Messenger of Allah (peace and blessings be upon him) said: "Ibn Jamil does not remember that he was poor and Allah made him rich. As for Khalid, you are wronging him; he has endowed his armour in the path of Allah. And as for Abbas (may Allah be pleased with him), his matter is my responsibility, and as much again besides." Then he said: "Do you not know that a man's paternal uncle is like his father?"
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الوقف / 11915