What is the meaning of the repetition of "holy" in Isaiah 6:3?

What is the meaning of the repetition of "holy" in Isaiah 6:3?

In Isaiah 6:3, the seraphim call one to another, saying:

Holy, holy, holy is the LORD of hosts; the whole earth is full of his glory!” (ESV)

קָדֹ֧ושׁ׀ קָדֹ֛ושׁ קָדֹ֖ושׁ יְהוָ֣ה צְבָאֹ֑ות מְלֹ֥א כָל־הָאָ֖רֶץ כְּבֹודֹֽו׃ (BHS)

I…

When was Deuteronomy written?

When was Deuteronomy written?

I am interested in the theories on when Deuteronomy was composed, and how it relates chronologically to Genesis, Exodus, Leviticus, and Numbers.
As discussed elsewhere on this site, some consider Deuteronomy the work of a later author (or …