NET
28 Because of this the land will mourn and the sky above will grow black. For I have made my purpose known, and I will not relent or turn back from carrying it out.”
Darby
28 For this shall the earth mourn, and the heavens above be black; because I have spoken it, I have purposed it, and will not repent, neither will I turn back therefrom.
KJV
28 For this shall the earth mourn, and the heavens above be black: because I have spoken [it], I have purposed [it], and will not repent, neither will I turn back from it.