Ezra 4:8
Rehum the chancellor and Shimshai the scribe wrote a letter against Jerusalem to Artaxerxes the king in this sort:
Cross-reference
Ezra 4:9
Parallel
Ezra 4:9 continues the list of those who wrote the letter introduced in verse 8, providing the names.
Ezra 4:7
Parallel
Ezra 4:7 introduces the letter to Artaxerxes; this cross-reference begins that specific letter, showing the exact correspondence.
Ezra 4:23
Parallel
Ezra 4:23 relates the aftermath: the same Rehum and Shimshai receive the king's reply and stop the work. Strong narrative link.