Sayyiduna Usayd bin Hudayr (may Allah be pleased with him) says that a man of the Ansar said to the Prophet (peace and blessings be upon him): O Messenger of Allah! You appointed so-and-so as a governor but you did not appoint me. He (peace and blessings be upon him) said: "After me you will see (others) given preference (over you), so be patient until you meet me at the Pond of Kawthar."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قتال أهل البغي / 16627