Charles Ellicott Commentary Haggai 1:12

"Then Zerubbabel the son of Shealtiel, and Joshua the son of Jehozadak, the high priest, with all the remnant of the people, obeyed the voice of Jehovah their God, and the words of Haggai the prophet, as Jehovah their God had sent him; and the people did fear before Jehovah." — Haggai 1:12 (ASV)

With all the remnant of. —The word may mean either “the remnant” restored from Babylon, or merely “the remainder” of the people. Similarly in Haggai 1:14; Haggai 2:2.