do not listen to the words of that prophet, or to that dreamer of dreams

"do not listen to what that prophet say nor to what the dreamer of dreams says"

with all your heart and with all your soul

Here "heart" and "soul" are metonyms for a person's inner being. These two phrases are used together to mean "completely" or "earnestly." See how you translated this in Deuteronomy 4:29. (See: rc://en/ta/man/jit/figs-metonymy and rc://en/ta/man/jit/figs-doublet)