What does Ezra 4:3 mean?

But Zerubbabel, Jeshua, and the other family leaders told them, 'You have no part with us in building a house for our God. We alone will build it for the Lord, the God of Israel, just as King Cyrus of Persia commanded us.' Ezra 4:3 - Modern Text Bible

(The leaders refused their help, wanting to keep the project in the hands of those who had returned from exile, following the king’s orders.)