בשורת הגאולה אות יז
A famous teaching of the Baal Shem Tov has it, that “Once there was a seven-year war between two gentile [kings] so a Tzadik would be able to hear a melody from the war marches which he used to serve Hashem.” (Kesser Shem Tov, Hosafos, Chapter 150) In this next part of the letter, the Rebbe expounds on the historic message this miraculous war carries for the spiritual mission of the Jewish people: