The Kedushah prayer is based on two quotes from angels: “Holy, holy, holy, is the Lord of Hosts...” (Isa 6:3) and “Blessed be the Glory of the Lord from its place” (Ezek 3:12). However, Shadal, the 19th century polymath, explains that the second verse is not a quote by angels, but the result of a scribal error.For more on Ezekiel's angelic visions, see here and links.
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