en_tn_condensed/jer/29/09.md

they are prophesying deceitfully ... I did not send them

Possible meanings: these words refer to the prophets and diviners, not to the dreams or "they are prophesying deceitfully" refers to the dreams, and "I did not send them" refers to the prophets and diviners.

this is Yahweh's declaration

"this is what I, Yahweh, have declared". Yahweh speaks of himself to express the certainty of what he is declaring. See Jeremiah 1:8.