Midrash sobre Êxodo 2:14

.And he said: Who made you a ruler and a judge over us? R. Yehudah says: Moshe was of twenty years at that time. They said to him: you are not yet worthy of being a ruler and a judge over as, for [it is said, Avot 5:21] "at forty [one aquires] wisdom." R. Nehemia said: He [Moshe] was of forty years at that time. They said to him: surely you are a man [of age], only you are not worthy to be a ruler and a judge over us. The sages say: They said to him: are you indeed the son of Yocheved? Then why do they call you son of Batya?! and you presume to be a ruler and a judge over us?! We will let be known what you did to the Egyptian. "Do you mean [Lit. say] to kill me?’ It is not written "do you mean", but "do you say". From this you learn, that [Moshe] uttered the proper name [of G-d] unto the Egyptian and killed him. When he [Moshe] heard this, his became fearful of Lashon Ha'ra [the evil tongue]. And he [Moshe] said "surely the thing is known". R. Yehudah son of R. Shalom said in the name of Hanina the Great and our sages who [in turn] said in the name of R. Alexandri: Moshe would wonder to himself and say: "what was Israel's sin, for which they became more enslaved than all other nation?" When he heard his [the Hebrew who struck his fellow's] words, he [Moshe] said: "such Lashon Harah [evil tongue] is amongst them, how would they be worthy of redemption?". And so he [Moshe] said: "Surely the thing is known" - now I know what is the cause of their enslavement....'He went out on the second day and behold to Hebrew men were fighting' - this was Datan and Aviram- who are called NITZIM fighting because of their end -- they were the ones who said this, they left over the Manna, they were the ones who said (Numbers 14:4) 'Appoint a head and let us return to Egypt', they rebelled at the Sea of Reeds. another explanation NITZIM they intended to kill each other...from here we recognize that a person who lifts up his hand to strike his friend, even though he doesn't (actually) hit him is called a wicked person....to teach that both of them were wicked

When do you learn that he lived in Pharaoh’s palace less than twenty years? We know it from the fact that at the time the two Hebrew men were fighting each other, they shouted at him: Who made thee a man? (Exod. 2:14), implying “you are not yet a man.” This indicates that he must have been less than twenty years of age.¹⁰Full manhood was achieved at twenty, the age of entering military service.

Thinkest thou to kill me? It does not say here “Do you desire to kill me?” but rather Thinkest thou to kill me? Thus you learn from this that he slew him merely by reflecting upon the Tetragrammaton. And Moses became fearful and said: Surely this thing is known (Exod. 2:14). He said to them: “You tell tales on each other, how can you be worthy of redemption?” And when Pharaoh hear this thing (ibid., v. 15). Apparently Dathan and Abiram informed against him (Moses), and he fled to Midian, where he remained twenty years, until Israel became worthy of redemption.