Midrash su Esodo 6:28

“It was during the days of Aḥashverosh; that [hu] Aḥashverosh who reigned from India to Kush, one hundred and twenty-seven provinces” (Esther 1:1). Hu [appears] five [times] for evil, and five for good. Five for evil: “He [hu] was a mighty hunter”⁴Nimrod. (Genesis 10:9); “he is [hu] Esau, father of Edom” (Genesis 36:43); “this is [hu] Datan and Aviram” (Numbers 26:9); “he is [hu] King Aḥaz” (II Chronicles 28:22); “that [hu] Aḥashverosh” (Esther 1:1). Five for good: “Abram, he is [hu] Abraham” (I Chronicles 1:27); “that [hu] Aaron and Moses…that [hu] Moses and Aaron” (Exodus 6:26–27); “David was [hu] the youngest” (I Samuel 17:14); “he [hu], Yeḥizhiyahu” (II Chronicles 32:30); “he [hu], Ezra, came up from Babylon” (Ezra 7:6). Rabbi Berekhya said in the name of the Rabbis from there: We have one that is better than all of them: “He is [hu] the Lord our God; His judgments are throughout the land” (Psalms 105:7), whose attribute of mercy is forever.

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.

4) R. Yossi Haglili says: In three places, the Torah limits dibbur to Moses — the land of Egypt, Mount Sinai, the ohel moed — the entire Torah! The land of Egypt — "And it was on the day that the L–rd spoke (dibber) to Moses in the land of Egypt" — Aaron is excluded from the dibroth of the land of Egypt. Mount Sinai — "And these are the generations of Aaron and Moses on the day that the L–rd spoke to Moses on Mount Sinai." The ohel moed — "And He called to Moses." Aaron is excluded from the dibroth of the ohel moed. He spoke to Moses and not to Aaron.

And the Lord spoke unto Moses and Aaron in the land of Egypt, saying (Exod. 12:1). Is it not a fact that He spoke only to Moses? Why, then, does the Scripture say unto Moses and Aaron? To indicate that just as Moses was included in the revelation, so too was Aaron. Where do we learn that He did not speak to Aaron? From the verse And it came to pass on the day that the Lord spoke unto Moses in the land of Egypt (Exod. 6:28), that is, to Moses and not to Aaron. Similarly in the above verse He spoke to Moses but not to Aaron. Why did He not speak to Aaron? In order (to enhance) Moses’ honor. However, if that were so, would not Aaron’s honor be diminished? No. For they were equals. You find that whenever two things are mentioned together they are of equal importance. On that day the heaven and the earth were finished (Gen. 2:1), and they are equal. Honor thy father and mother (Exod. 20:12), and they are equal. Joshua the son of Nun and Caleb the son of Jephunneh (Num. 14:38), and they were equals. Similarly, Moses and Aaron were equals.

...Why was the Holy Blessed One called the King of glory?  Because He distributes glory to those who fear Him.  How so?  A king of flesh and blood, no one rides on his horse, and no one sits on his throne. But the Holy Blessed One had Solomon sit upon His throne, as it says "Solomon sat on the throne of the Lord as king" (I Chronicles 29:23).  And [the Holy Blessed One] had Elijah ride on His horse.  What is the horse of the Holy Blessed One? Whirlwind and storm! As it says "God travels in whirlwind and storm and clouds are the dust on His feet" (Nachum 1:3) and it is written "Elijah ascended in the storm to heaven" (II Kings 2:11).  A king of flesh and blood, no one uses his scepter, but the Holy Blessed One, gave His scepter to Moses, as it says "Moses took the staff of God in his hand" (Exodus 4:20).  A king of flesh and blood, no one wears his crown, but the Holy Blessed One will have the Messiah wear His crown.  What is the crown of the Holy Blessed One? Finest gold, as it says "His head is finest gold, His locks are curled, black as a raven." (Song of Songs 5:11),  and it is written, "You have set upon his head a crown of fine gold" (Psalms 21:4). A king of flesh and blood, no one wears his clothing, but Israel wears the clothing of the Holy Blessed One.  What is the clothing of the Holy Blessed One? Strength, as it says "the LORD is robed, girded with strength" (Psalms 93:1), and He gave it to Israel as it says "God gives strength to Israel, God blesses His people with peace" (Psalms 29:11)... 

10) "which the L–rd commanded Moses in Mount Sinai (on the day, etc."): From here we derive that the commands in the desert of Sinai were stated only in the daytime. And whence do we derive that the commands in Egypt were stated only in the daytime? From (Shemoth 6:28): "And it was on the day that the L–rd spoke to Moses in the Land of Egypt." And whence is it derived that the commands in the tent of meeting were stated only in the daytime? From (Bamidbar 1:1): ("And the L–rd said to Moses) in the desert of Sinai in the tent of meeting." The commands in the tent of meeting are hereby likened to the commands in the desert of Sinai. Just as the commands in the desert of Sinai were stated only in the daytime, so, the commands in the tent of meeting.

(Bamidbar 7:89) "And when Moses came to the tent of meeting": (Why is this mentioned? We already know that the L-rd spoke to him from the tent of meeting.) From (Vayikra 1:1) "and the L-rd spoke to him from the tent of meeting," I understand directly from the tent of meeting. It is, therefore, written (Shemot 25:22) "And I will be appointed for you (to speak to you) there, and I will speak to you from above the kaporeth (the ark cover)." It is impossible to say from the tent of meeting, for it is already written "from above the kaporeth," and it is impossible to say "from above the kaporeth," for it is already written "from the tent of meeting." How, then, are these two verses to be reconciled? This is a rule in the Torah: Two verses which contradict each other are to "remain in their place" until a third verse comes and reconciles them, (the third verse, in this instance, being) "And when Moses came to the tent of meeting." Scripture hereby tells us that Moses would enter and stand in the tent of meeting, and the Voice would descend from the heaven of heavens to between the two cherubs (on the ark cover) and he would hear the Voice speaking to him from within. R. Yehudah b. Betheira says: Thirteen utterances were addressed to (both) Moses and Aaron, and, corresponding to these, thirteen "exclusions" (i.e., Aaron being excluded), to teach that they were not addressed to Aaron, but only to Moses to tell to Aaron. They are; (Shemot 25:22) "And I will be appointed for you there, and I will speak with you, all that I shall command you," (Shemot 30:6) "where I will be appointed for you," (Ibid.) "to speak to you there," (Shemot 31:18) "to speak with him," (Vayikra 7:38) "on the day that he commanded," (Bamidbar 7:89) "And when Moses came to the tent of meeting to speak with Him," (Ibid.) "speaking with him," (Vayikra 1:1) "And the L-rd spoke to him," and one in Egypt (Shemot 6:28) "And it was on the day that the L-rd spoke to Moses in the land of Egypt," and one in Sinai (Bamidbar 3:1) "on the day the L-rd spoke to Moses on Mount Sinai," and one in the tent of meeting (Bamidbar 7:89) "And He spoke to him." — Thirteen exclusions, Aaron being excluded in all instances.