At evening-tide trouble - In the time of evening - that is, in the night.
Before the morning he is not - That is, he is destroyed. This is strikingly descriptive of the destruction of the army of Sennacherib on that fatal night when the angel of the Lord killed 185,000 men (see the note at Isaiah 37:36).
This is the portion of them that spoil us - Of those who would plunder us. This is a “general” declaration in regard to the enemies of the Jewish people. This is the lot, the end, the destiny of all who attempt to destroy them. That is, the people of God shall be safe whoever rises up against them; and whatever may be the number, or the power of their foes, they shall be overthrown.