Commentaries:
Jamieson, Fausset, and Brown
Rejoice—at our calamities (Psalms 137:7). This is a prophecy that Edom should exult over the fall of Jerusalem. At the same time it is implied, Edom's joy shall be short-lived. Ironically she is told, Rejoice while thou mayest (Ecclesiastes 11:9).
cup—for this image of the confounding effects of God's wrath, see Jeremiah 13:12; Jeremiah 25:15-16, Jeremiah 25:21; as to Edom, Jer. 49:7-22.
Other Jamieson, Fausset, and Brown entries containing Lamentations 4:21:
Job 21:20
Job 21:21
Psalms 137:7-9
Isaiah 34:6
Isaiah 34:8
Jeremiah 25:15
Jeremiah 25:20
Jeremiah 51:39
Obadiah 1:16
Habakkuk 2:16
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