New Defender's Study Bible Notes
7:2 four corners of the land. The land of Israel (and/or Judah) did not have just four corners. The phrase obviously means “the four quarters,” or even the four directions. See note on Revelation 7:1.
7:14 blown the trumpet. The Apostle Paul applied this verse in rebuking believers who fail to give clear and uncompromising testimony to God’s truth. “If the trumpet give an uncertain sound,” he wrote, “who shall prepare himself to the battle?” (I Corinthians 14:8).
7:24 the worst of the heathen. This was God’s evaluation of the moral character of the Babylonian armies. They were more violent and wicked than even the Egyptians and Assyrians, whom they had recently defeated.