Walk through Amos, verse by verse, with the great Bible Commentaries of Matthew Henry (1662 - 1714) & Adam Clarke (1760 - 1832)
5:20
5:20
Shall not the day of the LORD be darkness, and not light? even very dark, and no brightness in it?
KJV
{Whether the day of the Lord shall not be darknesses, and not light; and mist, and not shining therein? } Wycliffe's Bible
It is madness therefore to defy the day of the Lord.