Commentaries
25:1-7. It is wicked to be glad at the calamities of any, especially of God's people; it is a sin for which he will surely reckon. God will make it appear that he is the God of Israel, though he suffers them for a time to be captives in Babylon. It is better to know Him, and to be poor, than to be rich and ignorant of him.
6, 7. "Because thou hast clapped thine hands," exulting over the downfall of Jerusalem, "I also will stretch out Mine hand upon thee" (to which Eze 21:17 also may refer, "I will smite Mine hands together").
hands … feet … heart—with the whole inward feeling, and with every outward indication. Stamping with the foot means dancing for joy.