When Gershon, Moses' son, heard these prophecies of Eldad and Medad, he hurried to his father and told him of them. Joshua was now greatly agitated about the prophecy that Moses was to die in the desert and that he as to be his successor, and said to Moses: "O lord, destroy these people that prophesy such evil news!" But Moses replied: "O Joshua, canst thou believe that I begrudge thee thy splendid future? It is my wish that thou mayest be honored as much as I have been and that all Israel be honored like thee."
Joshua Tries to Silence Eldad and Medad's Prophecy
Legends of the Jews 4:72