Nehemiah 6:3-5

3And I sent messengers to them, saying, I am doing a great work, so that I cannot come down: why should the work cease, while I leave it, and come down to you?

4Yet they sent to me four times in this way; and I answered them after the same manner.

5Then Sanballat sent his servant to me in like manner the fifth time with an open letter in his hand;