Ezra:
Ezra 4:1-5 - opposition to the rebuilding [ King James, NIV ]
Ezra 4:6-24 - later opposition under Xerxes and Artaxerxes [ King James, NIV ]
Nehemiah:
Nehemiah 4 - opposition to the rebuilding [ King James, NIV ]
Nehemiah 6:1-14 - further opposition to the rebuilding [ King James, NIV ]