“Now the prophets, Haggai and Zechariah son of Iddo, prophesied to the Jews who were in Judah and Jerusalem, in the name of the God of Israel who was over them. Then Zerubbabel son of Shealtiel and Jeshua son of Jozadak set out to rebuild the house of God in Jerusalem. With them were the prophets of God, helping them.”
Haggai and Zechariah are the names of prophetic books of the Bible. So unlike Isaiah and, Jeremiah, they are known as part of the 12 Minor Prophets. Now we are back to Zerubbabel and Jeshua as in chapter 3 and the building of the foundation of the Temple. These two prophets were now helping and encouraging them to build the Temple. It appears that those objections in the preceding chapter may have come after the start of the rebuilding of the Temple since those objections were about the wall of Jerusalem, rather than the Temple itself.