Isaiah 31: seek help from the Lord, not from men.

 In Isaiah 31 we read:

1-3 Doom to those who go off to Egypt

    thinking that horses can help them,

Impressed by military mathematics,

    awed by sheer numbers of chariots and riders—

And to The Holy of Israel, not even a glance,

    not so much as a prayer to God.

Still, he must be reckoned with,

    a most wise God who knows what he’s doing.

He can call down catastrophe.

    He’s a God who does what he says.

He intervenes in the work of those who do wrong,

    stands up against interfering evildoers.

Egyptians are mortal, not God,

    and their horses are flesh, not Spirit.

When God gives the signal, helpers and helped alike

    will fall in a heap and share the same dirt grave.

Assyria and Egypt were the great super powers surrounding Israel and Judah. King Hezekiah was afraid of Assyria so he was tempted to seek an alliance with Egypt. Isaiah was warning that God is much more powerful than Egypt - Judah should rest in the Lord and not in an alliance with Egypt.