This document is about Darius (Darius I). For other homonyms, please refer to the Darius document. King of the Persian Empire. 
Although the return of captives to Jerusalem was proclaimed by the Cyrus decree and the temple reconstruction was carried out, it was halted due to slanderous letters sent by surrounding foreign peoples, including Samaria, at the time. It was during the reign of Darius I that it was rebuilt again.
Ezra 4:4They hired counselors against them, to frustrate their purpose, all the days of Cyrus king of Persia), even until the reign of Darius king of Persia.Ezra 4:5In the reign of Ahasuerus, in the beginning of his reign, they wrote an accusation against the inhabitants of Judah and Jerusalem.
Ezra 4:24Then work stopped on God’s house which is at Jerusalem. It stopped until the second year of the reign of Darius king of Persia.
Ezra 6:1A scroll was found at Achmetha, in the palace that is in the province of Media, and in it this was written for a record:
Ezra 6:12Then Tattenai, the governor beyond the River, Shetharbozenai, and their companions did accordingly with all diligence, because Darius the king had sent a decree.Ezra 6:13The elders of the Jews built and prospered, through the prophesying of Haggai the prophet and Zechariah the son of Iddo. They built and finished it, according to the commandment of the God of Israel, and according to the decree of Cyrus, Darius, and Artaxerxes king of Persia.Ezra 6:14This house was finished on the third day of the month Adar, which was in the sixth year of the reign of Darius the king.Ezra 6:15The children of Israel, the priests, the Levites, and the rest of the children of the captivity, kept the dedication of this house of God with joy.
Haggai 1:1“This is what Yahweh of Armies says: These people say, ‘The time hasn’t yet come, the time for Yahweh’s house to be built.’ ”