Charles Ellicott Commentary Ezra 3:2

"Then stood up Jeshua the son of Jozadak, and his brethren the priests, and Zerubbabel the son of Shealtiel, and his brethren, and builded the altar of the God of Israel, to offer burnt-offerings thereon, as it is written in the law of Moses the man of God." — Ezra 3:2 (ASV)

Built the altar. —Only as the beginning of their work. The Temple was, as it were, built around the altar, as the centre of all.

Moses the man of God. —Like David, Nehemiah 12:24; Nehemiah 12:36.