What does Psalm 66:9 mean?

The psalmist credits God with preserving His chosen people (Deuteronomy 14:2). Despite harsh conditions and hostile enemies, He protected Israel during the wilderness wanderings (Psalm 105:40–42). At times He supernaturally intervened in attacks made against them. An example of this is when the massive Assyrian army laid siege to Jerusalem. God answered that threat by slaying tens of thousands of enemy soldiers (Isaiah 36—37). Despite their troubles, God has preserved His people through the centuries.

He will also protect them during the coming tribulation. Revelation 12 describes some of this end-times persecution; saved Jewish persons will receive a safe hiding place (Revelation 12:13–14). God can be trusted to protect and preserve His people! Jude 1:24 promises that He is able to keep believers from falling and escort them safely into "the presence of his glory with great joy."