Albert Barnes Commentary Isaiah 30:3

"Therefore shall the strength of Pharaoh be your shame, and the refuge in the shadow of Egypt your confusion." — Isaiah 30:3 (ASV)

Therefore shall the strength of Pharaoh be your shame - (see the note at Isaiah 20:5).

Your confusion - Hebrew, ‘For reproach.’ It would either occur that the Egyptians would not enter into an alliance; or that if they did, they could not defend them, and in either case it would be the source of deep regret and shame.