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A 15th century Ḥanukkah vs. Shabbat rap battle. Technically it’s not a rap battle–just a piyyut introducing “Mi Khamokha” in the blessing after the Shema on the Shabbat morning of Ḥanukkah . . . .
The earliest recorded prayer or piyyut providing an acrostic for the 42 letter divine name. . . .
Essa Lameraḥoq by Aharon ben Yosef of Constantinople, with an English translation. . . .