Midrash sur L’Exode 3:14

I will be that I will be (Ex. 3, 14).The Holy One, praised be He! said unto Moses, "Go and tell Israel that I was with you during this subjugation and I will be with you during the next subjugation." So Moses said unto Him: "Sovereign of the Universe, is not the affliction terrible enough when it is really present [without telling of it beforehand]?" Whereupon the Holy One, praised be He! said unto Moses: "Then go and tell, 'I will be,' sent me unto you." Answer me, O Lord, answer me (I Kings 18, 37). R. Abuhu said: "Why did Elijah say twice. Answer me? We infer from this that Elijah said, before the Holy One, praised be He! 'Sovereign of the Universe, answer me that a fire shall come down from Heaven and consume everything that is upon the altar; and answer me, to remove from their mind that they shall not think it was the result of sorcery,' as it is said (Ib.) Thou hast turned their hearts back again.":

(Zech. 14, 9) And the Lord will be king over all the earth; on that day shall the Lord be (acknowledged) One, and His name be One. Is He then not One to-day? R. Acha b. Chaninah said: "This world is not like the world to come; in this world, when good tidings are received, a man says: Blessed be He who is good and beneficent and upon the information of bad tidings, he says: Blessed be He, the true Judge. But in the world to come, only the first benediction will be pronounced [for there shall be no more bad tidings]." His name shall be One. What means this passage? Is then His name not One even today? R. Nachman b. Isaac said: "Not as this world is the world to come; in this world His name is written Yud, Hay, and pronounced Alef, Daleth, while in the world to come it will be pronounced as it is written, with Yud, Hay." Raba wanted to lecture [concerning the explanation of God's name] from the pulpit; so a senior scholar warned him against it, saying: "It is written (Ex. 3, 14) [This is my name] Le'olam [hence you must not openly discuss it]." R. Abina raised the following contradiction: "It is written, This is my name, Le'olam (to de concealed), and then it is written, This is my memorial unto all generations [showing that it should be read without concealing it];" i.e., "Thus said the Holy One, blessed be He! Not as My name is written shall it be pronounced: it is written Yud, Hay, but is prononced Alef Daleth."

Another interpretation (of Exod. 6:3): AND I APPEARED UNTO ABRAHAM, UNTO ISAAC, AND UNTO JACOB AS EL SHADDAI, BUT BY MY NAME Y--H I WAS NOT KNOWN TO THEM. I did not proclaim⁴¹From the Gk.: parresiazesthai, i.e., “to speak freely.” it to them <even> if it was pronounced,⁴²Although the Divine Name appears several times in Scripture before the time of Moses, and was specificially revealed to Abraham (Gen. 15:7) and Jacob (Gen. 18:13), the Holy One had never before revealed it in answer to a specific request and never pronounced it in the way that he did for Moses in Exod. 3:14. but to you I have revealed it because you are going to redeem Israel, so as to make them prosper.⁴³Exod. R. 6:4. The Holy One said: In this world I have revealed my name to individuals, but in the world to come, I am making my name known to all Israel, as stated (in Is. 52:6): THEREFORE MY PEOPLE SHALL KNOW MY NAME….

Moses said before the Holy One, blessed be He: Sovereign of all worlds! Make known to me Thy great and holy Name, that I may call on Thee by Thy Name, and Thou wilt answer me, as it is said, "And God said unto Moses, I am that I am" (Ex. 3:14). "And God further said (to Moses)" (Ex. 3:15).