The first readings for these beginning days of Advent are all taken from the Book of Isaiah. It is a complex book in many ways and it is one of the most cited books of the Old Testament by New Testament writers indicating the importance and esteem it holds in the scriptural imagination. You can read a short introduction to the book here.
Today the first reading is taken from Isaiah 2:1-5, whose opening is duplicated almost exactly in Micah 4:1–3. Like Isaiah, Micah was an eighth-century prophet of the southern kingdom. Both prophets held Mount Zion to be a sacred mountain, the center of the earth, and important for the whole world – the same sentiment expressed in Psalms 46–48.
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