John Gill Commentary Nehemiah 6:8

"Then I sent unto him, saying, There are no such things done as thou sayest, but thou feignest them out of thine own heart." — Nehemiah 6:8 (ASV)

Then I sent unto him
Whether a letter, or a messenger, is not said:

saying there are no such things done as you say ;
that there was any scheme formed to rebel, and make him king, or that prophets were appointed to declare him such:

but you feign them out of your own heart ;
in short, that they were no other than lies of his own inventing.