The Kedushah (קדושה) is traditionally the third section of all Amidah recitations. In the silent Amidah it is a short prayer, but in the repetition, which requires a minyan, it is considerably lengthier. The liturgy varies among different communities and during different services, but they all hold in common three lines from the Bible (though...
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http://en.wikipedia.org/wiki/Kedushah
a liturgical prayer of varying form that is incorporated into the third blessing of the Amidah during the repetition of this prayer by the cantor.
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https://www.infoplease.com/dictionary/kedushah
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