Nehemiah 6:15-17

15So the wall was finished on the twenty-fifth [day] of [the month] Elul, in fifty-two days.

16When all our enemies heard about it, and all the [Gentile] nations around us saw it, they lost their confidence; for they recognized that this work had been accomplished with the help of our God.

17Moreover, in those days many letters went from the nobles of Judah to Tobiah, and Tobiah’s letters came to them.