Rabbi David Kimchi's Commentary upon the Prophecies of Zechariah

1 “In the eighth month, in the second year of Darius, was the word of the Lord unto Zechariah, the son of Berechiah, the son of Iddo, the prophet, saying”

“The prophet] is to be referred to Zechariah, though perhaps Iddo may also have been a prophet, for it is said that he is the same as Iddo, the seer. (2 Chron. ix. 29.) We have also found in the Midrash the words, “Iddo, the prophet.”

“Saying” to Israel, as is immediately added, “And thou shalt say unto them.” Say unto them, that they should remember the displeasure wherewith the Lord was displeased with the fathers, that is, with the generation in whose time the temple was desolated; they should also remember that it was on account of their deeds that the Lord was displeased with them, they should therefore return to the Lord, and not be like their fathers. They were at this time slothful in building the temple, for they did not begin to build until the ninth month, and evil deeds were still in their hands, as is written in the book of Ezra.