Midrash su Numeri 3:1

R. Samuel b. Nachmeni in the name of R. Jonathan said: "He who teaches the Torah to the son of his neighbor, Scripture considers him as if he begot him, as it is said (Num. 3, 1) And these are the generations of Aaron and Moses; and the following verse reads: And these are the names of the sons of Aaron, to teach you that Aaron begot [his sons] but Moses taught them, therefore they are recorded under his name." (Is. 29, 22) Therefore thus hath said the Lord unto the house of Jacob, he who hath redeemed Abraham. Where do we find that Jacob redeemed Abraham? R. Juda said: "He redeemed him from the trouble of rearing children. And this is what is meant by the passage (Ib) Not now shall Jacob be ashamed, and not now shall his face he made pale — i.e., he shall not be ashamed of his father and his face shall not become pale because of his grandfather."

2) The limitations: (Bamidbar 7:89): "And when Moses came to the ohel moed (for the L–rd) to speak to 1 him, that he heard the voice speaking to 2 him … and He spoke to him." (Shemoth 25:22): "And I will be appointed for you there, and I will speak to you … all that I will charge you with to the children of Israel." (Shemoth 29:42): "… where I shall appoint a time for you (plural) to speak to you (singular) there." (Shemoth 30:6):

3) "… where I shall be appointed for you." (Vayikra 7:38): "… which the L–rd commanded Moses on the day that He charged him unto the children of Israel…" (Shemoth 34:35): "… until he came, [for the L–rd] to speak to 10 him." [(Shemoth 6:28): "… It was Moses and Aaron," immediately followed by] (Shemoth 6:29): "And it was on the day that the L–rd spoke to Moses in the land of Egypt." (Bamidbar 3:1): "And these are the generations of Aaron and Moses on the day that the L–rd spoke to Moses on Mount Sinai." (Vayikra 1:1): "And He called to Moses, and the L–rd spoke to him." — Aaron is excluded from all.