Ezekiel 21:19
Also, thou son of man, appoint thee two ways, that the sword of the king of Babylon may come: both twain shall come forth out of one land: and choose thou a place, choose it at the head of the way to the city.
Cross-reference
Ezekiel 21:3 introduces the drawn sword against Israel, which verse 19 then routes to specific cities — a direct internal link.
Ezekiel 21:11 describes the sword's polishing and readiness, leading into the signpost action of verse 19.
Ezekiel 4:1 commands drawing a city on a brick — similar symbolic action of marking to depict Jerusalem's siege, as here marking two ways for the sword.
Ezekiel 5:1-17 uses a parallel symbolic act (shaving) to depict Jerusalem's judgment, reinforcing the same prophetic sign language.
Ezekiel 23:23 lists Babylonians as agents of judgment, reinforcing the identity of the sword-wielding king in this passage.
Jeremiah 4:7 portrays Babylon as a destroyer of nations, directly paralleling the sword of the king of Babylon here.