Midrash su Esodo 16:20

And he went out on the second day, and behold, two men of the Hebrews were striving together (Exod. 2:13). Who were these men? They were Dathan and Abiram, who later said: Let us make a captain, and let us return to Egypt (Num. 14:4). They were the ones who rebelled at the Red Sea and kept some of the manna (as “leftovers,” not believing that God would supply them with more the next day), as it is written: But some of them left of it until the morning (Exod. 16:20). Likewise, they were the ones who went out to gather it up (on the Sabbath, which was forbidden), but were unable to find any (as Moses had warned). They were also the ones who participated in his (Moses’) conflict with Korah. Hence it is said: It was Dathan and Abiram. They were involved in wickedness from beginning to end. He said to him that did wrong: “Wherefore smitest thou thy fellow?” (Exod. 2:13), that is to say: “Why do you strike one who is just as wicked as you are?” And they retorted: Who made thee a man, ruler and judge over us? This implied: “You are not yet a man, indeed you are only a lad, and yet you try to act as though you are a ruler and a judge over us.”

Rabbi Tanchum said: Joseph commanded and they built the treasure-houses in each city, and he gathered all the produce of the lands into the treasure-houses. The Egyptians were scoffing at him, saying: Now the worms will eat the stores of Joseph. But no worm had any power over them; neither did the (stores) diminish until the day of his death. And he supported the land in the famine of bread, therefore was his name called Kalkol. And Kalkol is Joseph, as it is said, "And Joseph nourished" (Gen. 47:12). Moreover, he nourished his father, and his brethren, and all his father's house, in the famine with bread to their satisfaction. "And Joseph nourished his father, and his brethren, and all his father's household, with bread, according to their families" (ibid.) ||