The seventh part of the qedushta for the ancient triennial Torah reading וַיְהִי בַּחֲצִי הַלַּיְלָה, “It Came to Pass at Midnight,” was preserved in the Haggadah. This is the only poem of Yannai’s (ca. 5th/6th cent. C.E.) to be retained in the liturgy.For more on Yannai's poetry, see here and links
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