children. sons.
Edom. Genesis 27:39; Genesis 27:40 was not fulfilled until the reign of Joram (2 Kings 8:20-23; 2 Chronicles 21:8-10 (compare 1 Kings 22:47). From that time they were implacable enemies.
day. Put by Figure of speech Metonymy (of Adjunct) for what happened at the time (App-6). Compare Job 18:20; Hosea 1:11.Joel 1:15.Luke 17:22; Luke 17:26; Luke 19:42; 1 Corinthians 4:3.
Who said. The reference is to what they said, not to what they did. to the encouragement given to Sennacherib, not to the help given to Nebuchadnezzar. That is what Obadiah,. later prophet, refers to. Isaiah (Hezekiah's contemporary) refers to the earlier words. See Isaiah 34:6. Here Edom does not go beyond words.
Rase it, rase it. Figure of speech Epizeuxis (App-6) for emphasis. This was said, not done, at that time.