Nehemiah 6:15-17

15So the wall was finished in the twenty and fifth day of the month Elul, in fifty and two days. 16And it came to pass, that when all our enemies heard of it, and all the heathen that were about us saw these things, they were much cast down in their own eyes: for they perceived that this work was wrought by our God. 17Moreover in those days the nobles of Judah sent many letters to Tobiah, and the letters of Tobiah came to them.1