2 Kings 18:21
Now, behold, thou trustest upon the staff of this bruised reed, even upon Egypt, on which if a man lean, it will go into his hand, and pierce it: so is Pharaoh king of Egypt unto all that trust on him.
Cross-reference
2 Kings 18:24 continues the same Assyrian taunt, asking how Judah can repulse even one officer while depending on Egypt.
2 Kings 17:4 shows King Hoshea relying on Egypt's king So, which led to Israel's fall — another example of trusting Egypt.
Isaiah 30:7 reinforces the image of Egypt as worthless help, calling her 'Rahab the Do-Nothing' — the same futility.
Isaiah 31:1-3 warns against relying on Egypt's strength, echoing the same condemnation of trusting in human alliances.
Isaiah 36:6 is a direct parallel account, repeating the same warning about Egypt as a broken reed in Rabshakeh's speech.
Jeremiah 46:17 mocks Pharaoh as 'but a loud noise' who missed his opportunity — similar derision of Egypt's unreliability.
Ezekiel 29:6 applies the same broken-reed metaphor to Egypt, now as God's judgment against them for failing Israel.
Ezekiel 29:7 elaborates on how leaning on Egypt injures those who trust it—exactly the injury Rabshakeh warned about.
Isaiah 20:5 prophesies shame for those who trusted in Cush and Egypt — directly relevant to the broken reed warning.
Isaiah 30:2 rebukes Israel for going to Egypt without God's direction—the same misplaced trust that Rabshakeh exploits in his taunt.
Jeremiah 2:16 says Egypt's men cracked Israel's skull — illustrating that relying on Egypt brings harm, like a piercing reed.