Wo - (see the note at Isaiah 30:1).
To them that go down to Egypt - (see the note at Isaiah 30:2).
And stay on horses - (see the note at Isaiah 30:16).
And trust in chariots - (see the note at Isaiah 21:7). That they were often used in war, is apparent from the following places Joshua 11:4; Judges 1:19; 1 Samuel 13:5; 2 Samuel 8:4.
Because they are many - Because they hope to secure the aid of many. See the references above. It is evident that their confidence in them would be in proportion to the number which they could bring into the field.
But they look not ... - (see the note at Isaiah 30:1)