Mount Horeb
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Mount Horeb is the mountain at which the Ten Commandments were given to Moses by God, according to the Book of Deuteronomy in the Hebrew Bible. It is described in two places as הַר הָאֱלֹהִים the "Mountain of Elohim". The mountain is also called the Mountain of YHWH.
Moses Striking the Rock at Horeb, engraving by Gustave Doré from "La Sainte Bible", 1865
Mountain on the Sinai Peninsula identified by Francis Frith as Horeb
Book of Malachi
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The Book of Malachi is the last book of the Neviim contained in the Tanakh, canonically the last of the Twelve Minor Prophets. In most Christian orderings, the grouping of the prophetic books is the last section of the Old Testament, making Malachi the last book before the New Testament.
Illustration of the coming of God's Messenger in 3:1, by Franciszek Żmurko
Quotation from Malachi 3:1 in an Austrian church: "The Lord shall come to his temple."