Woe. The first woe. See the Structure above. the day of the LORD. See notes on Isaiah 2:12; Isaiah 13:6; Joel 2:1
darkness, and not light. Note the Figure of speech Pleonasm (App-6) for emphasis. Compare Jeremiah 30:7; Joel 2:2.Zephaniah 1:15.
Related Commentaries of Amos 5:18
Amos 5:18
18 Woe unto you that desire the day of the LORD! to what end is it for you? the day of the LORD is darkness, and not light.