en_tn/neh/06/08.md

Then I sent word to him

Here "I" refers to Nehemiah and "him" to Sanballat.

No such things have occurred as you say

"None of the things you have written have occurred"

for within your heart you invented them

Here the "heart" refers to the "mind," that is, to one's desires and thoughts. Alternate translation: "for within your mind you invented them" or "for you have made this up in your own imagination" (See: rc://en/ta/man/translate/figs-metonymy)