Albert Barnes Commentary Ezra 5:2

"Then rose up Zerubbabel the son of Shealtiel, and Jeshua the son of Jozadak, and began to build the house of God which is at Jerusalem; and with them were the prophets of God, helping them." — Ezra 5:2 (ASV)

Began to build - i. e., “made a second beginning” - recommenced the uncompleted work.

Helping them - By infusing zeal into the people .