v1-2: Following a gap of some years, the work was restarted. Haggai and Zechariah the prophets encouraged Jeshua and Zerubbabel. Even in the difficult situation, the people obeyed. Outside opposition still remained. The existence of opposition is not always a reason to stop working.
v3-5: There was a new governor over the region, Tattenai. Although he questioned the Jews' work, he allowed the work to continue while a report was sent to Darius. Thus, by God's encouragement through the prophets, and His overruling, the work was restarted.
v6-10: The letter from Tattenai to Darius was full of respect; his respect for the king, but also his respect for the Jewish people; there was no emotive criticism as had characterised the previous letter (4.12-16), but rather a testimony to the diligence of the people.
v11-12: The letter included the reply from the Jewish people; Tattenai had asked the names of their leaders. In reply, they said, "We are servants of the God of heaven and earth"; what was important was not their names, but the One they served (Gen 24.34).
Their reply about the city; the city had originally been built by "a great king of Israel". But both the city and temple had been destroyed through the people's disobedience to God, not because of Jerusalem's rebellious attitude to Persia or its predecessors (contrast 4.15).
v13-16: The further factual statement, concerning the decree of Cyrus. The decree had directed that the temple be rebuilt, but only the foundation had been laid. Cyrus writes to Sheshbazzar, the Babylonian name for Zerubbabel.
v17: The Jews had evidently asked that a search be made for Cyrus' decree, and Tattenai repeated this request. Thus the Jews looked for vindication of their actions in restarting the building work.