Talmud zu Bamidbar 11:28

Rabbi Eliezer ben Shamua would say: Let your student’s honor be dearer to you than your own. Honor your friend with the reverence you have for your teacher. And revere your teacher with the reverence you have for Heaven. This teaches that one’s student’s honor should be as important to him as his friend’s honor. Everyone should learn from Moses our teacher, who said to Joshua (Exodus 17:9), “Choose men for us.” He did not say: Choose for me, but “choose for us.” This teaches that Moses treated Joshua like an equal, even though Moses was the master and Joshua was his student. Where do we learn that your friend’s honor should be as dear to you as your teacher’s? From what it says (Numbers 12:11), “Then Aaron said to Moses: Oh, my lord.” But wasn’t Moses his younger brother? Yet this shows that he treated him like a teacher. And from where do we know that your teacher’s honor [should be] as dear to you as the honor of Heaven? From what it says (Numbers 11:28), “And Joshua, who was Moses’ attendant from the time he was young, answered and said: My Lord, Moses, stop them!” For he regarded Moses as equivalent to the Divine Presence itself.
At first they would say: there is grain in Judah, straw in the Galilee, and chaff on the other side of the Jordan. But then they began to say: There is no grain in Judah. There is no straw in the Galilee, but there is chaff. And on the other side of the Jordan, there is neither.