Jeshua. Concerning Jeshua and Zerubbabel, see on ch. 2:2.
Builded the altar. The old Temple area must have been surveyed, and the place ascertained where the altar of burnt offering had originally been located. On that sacred spot a new altar was built. The altar was the center of Jewish worship, and services could not be carried on without it. The altar must have been completed by the last day of the 6th month.
As it is written. Under the leadership of men like Daniel and Ezekiel the exiles had determined to start from the beginning to worship God according to His expressed will, and not again fall into the sins of indifference and idolatry, on account of which they and their fathers had had to suffer so much. Reference is probably here made to Lev. 17:2-6 and Deut. 12:5-7, where God explicitly commands the Israelites to offer their sacrifices only at the place He would select for that purpose. That place was Jerusalem.