Final answer:
Jeremiah is the prophet who wrote about the New Covenant in the Old Testament.
Step-by-step explanation:
Jeremiah is the prophet who wrote about the New Covenant. In the Old Testament of the Bible, Jeremiah prophesied about a future covenant that God would make with His people. This covenant was described as a 'new' covenant, where God's law would be written on the hearts of people instead of on tablets of stone.
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