Isaiah
Isaiah 36:6ESV·traditional attribution

Behold, you are trusting in Egypt, that broken reed of a staff, which will pierce the hand of any man who leans on it. Such is Pharaoh king of Egypt to all who trust in him.

John Calvin Reformed @genevareformer

6. Behold, thou hast trusted in, that broken staff of reed. This is probably separate from the former verse; for, having formerly said that the eloquence by which he flatters the people is all that Hezekiah possesses, and having inferred from this that his confidence is exceedingly foolish, he now comes to other particulars.

Matthew Henry Presbyterian @wholebiblehenry

We shall here only observe some practical lessons. 1. A people may be in the way of their duty and yet meet with trouble and distress. Hezekiah was reforming, and his people were in some measure reformed; and yet their country is at that time invaded and a great part of it laid waste.

Commenting on Isaiah 36:1-10

John Gill Reformed Baptist @doctorgill

Lo, thou trustest in the staff of this broken reed, on Egypt,.... His ally and auxiliary; and which is rightly called "the staff of a broken reed", if trusted to, and leaned upon, being weak and frail, and an insufficient ground of confidence to depend upon; the allusion seems to be to the cane or reed which grew upon the banks of the river Nile...