What is "Sofer Mahir"?
Ibn Ezra: The Targum is, he tells and counts quickly.
Malbim: He was a great Chacham. Shimon ha'Tzadik, who was from the remnant of Anshei Keneses ha'Gedolah, said that the world stands on three pillars. In the days of Anshei Keneses ha'Gedolah, three men strengthened the pillars. Zerubavel and Yehoshua Kohen Gadol built the Mikdash and strengthened Avodah. Afterwards, Ezra founded the pillar of Torah. Afterwards, Nechemyah built the walls of Yerushalayim and engaged in politics to strengthen Chesed.
Who gave to Ezra all that he requested?
Rashi: Daryavesh.
What do we learn from "k'Yad Hashem Elokav Alav"?
Rashi: It is like Hashem commanded him. The verse should be rearranged. It means, the king gave to Ezra all that he requested, like Hashem's hand (command) on him. Ezra is Mal'achi (Megilah 15a).
Ibn Ezra: Yad Hashem is strength and power.
Malbim: Hashem helped him, lest Torah be forgotten from Yisrael.
