Jeremiah 4:28

28 Because of this the land will mourn
and the sky above will grow black.
The earth and the heavens are personified here and depicted in the act of mourning and wearing black clothes because of the destruction of the land of Israel.

For I have made my purpose known
Heb “has spoken and purposed.” This is an example of hendiadys where two verbs are joined by “and” but one is meant to serve as a modifier of the other.

and I will not relent or turn back from carrying it out.”
Heb “will not turn back from it.”

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