1)
To whom did he send this?
1.
Ibn Ezra: To Ezra, and Yisraelim who volunteered to ascend.
2)
What did he command?
1.
Rashi: Any Yisrael who wants to ascend, he will ascend with Ezra.
2.
Malbim: Koresh's command was to permit Yisraelim to ascend to build the Beis ha'Mikdash. After it was built, the command ceased. Those who were still in Galus needed special permission to ascend; he now gave permission.
