Lo, thou trusteth in the staff of this broken reed— This comparison is excellently adapted to denote an ally, who is not only weak and unable to help, but also dangerous to those who rely upon him for succour; and his representing the power of Egypt to be as brittle as the reeds growing upon the banks of the Nile, (for to these doubtless the Syrian orator alludes) is a great beauty in the similitude. See Ezekiel 29:6.
Related Commentaries of Isaiah 36:6
Isaiah 36:6
6 Lo, thou trustest in the staff of this broken reed, on Egypt; whereon if a man lean, it will go into his hand, and pierce it: so is Pharaoh king of Egypt to all that trust in him.