The earliest mention of this text of Aleinu LeShabei’ach as part of the prayer service is found in the Gaonic responsa Shaarei Teshuva §43. Rabeinu Hai Gaon writes that this prayer was composed by Yehoshua bin Nun when the Jews entered the land of Israel.
In sefer Seder Hayom, we find that Yehoshuah actually used this prayer, by saying it seven times, to destroy the seven city walls of Jericho.
In Seder Olam, Chapter 11, we see that this happened on the 28th of Nissan.
𝐏𝐚𝐫𝐞𝐧𝐭𝐬 𝐀𝐧𝐧𝐢𝐯𝐞𝐫𝐬𝐚𝐫𝐲 𝐨𝐫 𝐁𝐢𝐫𝐭𝐡𝐝𝐚𝐲?
Present them with the gift of their heritage — their very own family tree!
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