And Moses did as the L-rd commanded him, and he took Joshua...and he laid his hands upon him, and gave him a charge (Deut. 27: 22-23)
The Talmud relates that Moses passed the mantle of leadership to Joshua "even more generously, and to a greater degree than he was commanded." (Moses had been commanded to "put some of your honor upon him.") Commented Rabbi Yossi Bar Chanina: From this we learn that a person is not jealous of his disciple. (Tractate Sanhedrin)