The phrase Na Nach Nachma Nachman Me'Uman was revealed and taught by Rabbi Yisroel Ber Odesser. Rabbi Odesser was born in 1888 in Tiberias, and was among the first Breslover Hasidim in Israel. In 1921 on the Fast of Tammuz he became weak and hungry and broke his fast. He felt guilty afterwards that he was unable to overcome his physical temptation. He prayed continuously for 5 days until he heard a voice instructing him to go into his room. He did that and randomly opened a book. In the book was a piece of paper that he later called "The Letter from Heaven." The English translation of this letter reads as follows, "It was very hard for me to descend to you, my precious student, to tell you that I benefited greatly from your service. And to you I say, my fire will burn until the coming of the Messiah. Be strong and courageous in your service. Na Nach Nachma Nachman Me'Uman. And with this I shall tell you a secret: Full and heaped up from line to line, and with strong devotional services you will understand it. And the sign is: They will say you are not fasting on the 17th of Tammuz."
The Rabbi believed the letter to be a message of consolation, directly from Rebbe Nachman of Breslov's spirit to himself. He adopted this phrase as his personal meditation, and became so personally identified with it that he later said that he was, Na Nach Nachma Nachman Me'Uman. He died at the age of 106, and this very expression appears on his grave stone in Jerusalem.
Rabbi Nachman of Breslov stated that a "song of redemption" would be revealed before the coming of Mashiach, and that this song would be in a single, double, triple, quadruple form, just like this phrase. In 1984 Rabbi Moshe Feinstein wrote a letter of approbation endorsing Rabbi Odesser's efforts to raise funds for publishing Rav Nachman's books. Rabbi Feinstein mentioned that he was inspired by a secret document which Rabbi Odesser possessed. Despite this, not all Breslover Hasidim use Na Nach Nachma, and not everyone believes that it is an authentic writing. Some believe that the letter was written by Rav Nachman to someone else and was placed in the old book, while others simply believe it was forged by one of Rabbi Odesser's students to distract him from feeling guilty over breaking his fast. There is even a theory that when he was a young student, a friend of his was just playing a trick on him and put the note in a book. But the Rabbi never opened that book until many, many years later. When he finally discovered it, his friend revealed the details of the practical joke to him. But, Rabbi Odesser refused to believe it was anything but a message from heaven.
But even if it was meant simply as a joke, and the words were just made up without any real meaning, it did come as a message from heaven. For who other than Hashem put those words into the mind of the friend? Indeed, these words have a significant connection to the end of days, and our upcoming, final geula. The key to uncovering this message is the atbash form of gematria. Let's examine the phrase carefully:
נ נח נחמ נחמן. The atbash of נ is 9. The atbash of נח is 69. The atbash of נחמ is 79 and finally the atbash of נחמן is 88. The difference between 9 and 69 is 60, the difference between 69 and 79 is 10 and finally the difference between 79 and 88 is 9. Thus we get 60 10 9. If you eliminate the 2 zeroes you are left with the number 619.
The Book of Torah containing more secrets about the end of days than any other is the Book of Daniel. Towards the end of this Book, Daniel asks G-d, מה אחרדת אלה, "what is the end of these matters?" G-d responds with the words לך דניאל, "go your way Daniel." G-d is not telling Daniel to stop inquiring about the end. His response is indeed the answer to Daniels's question, for the atbash of לך דניאל, is 619 which is also the same value as אחרית, which means the end. Thus, G-d is answering Daniel by telling him that the end is indeed the end. But the end of what or whom? It will be the end of evil, scepticism, doubt, falsehood and conflict. And just when will this end period begin? The last word of the phrase מאומן Me'Uman tells us. For the gematria of this word is 137, the same value as מגדלין (Towers) and בּן לאדן (Bin Laden). Thus, this clue tells us that at the time that Bin Laden destroys the towers (the twin towers on 9/11/01), know for certain that the end of days has arrived.
The letter indeed was a letter from Heaven telling mankind that for some there will be a final end, but for others there will be a brand new beginning.