Nehemiah 6:15-19 NIV
So the wall was completed on the twenty-fifth of Elul, in fifty-two days.
When all our enemies heard about this, all the surrounding nations were afraid and lost their self-confidence, because they realized that this work had been done with the help of our God.
Also, in those days the nobles of Judah were sending many letters to Tobiah, and replies from Tobiah kept coming to them. For many in Judah were under oath to him, since he was son-in-law to Shekaniah son of Arah, and his son Jehohanan had married the daughter of Meshullam son of Berekiah. Moreover, they kept reporting to me his good deeds and then telling him what I said. And Tobiah sent letters to intimidate me.
NIV: New International Version