Zechariah 8:9

The Lord also told the people to gain strength from the words of the prophets who had encouraged them to complete the rebuilding of the temple ever since they began the project (cf. Joshua 1:7; 2 Samuel 2:7; 2 Samuel 16:21; Haggai 2:4). These prophets were Haggai, Zechariah, and perhaps others (Ezra 5:1-2). Probably the resumption of construction in 520 B.C. (Haggai 2:18) is in view rather than the restoration of the foundation in 536 B.C. (Ezra 3:8). Between these dates the people did little work on the temple, especially between 530 and 520 B.C.