“They have seen vanity and lying divination who say, ‘the oracle of Yahweh', and Yahweh has not sent them. And they have made men hope that the word would be confirmed.”
The false prophets have given people false hope with false visions and lying divination. The word for ‘divination' is regularly used in a bad sense of using false means to obtain ‘divine' guidance (Ezekiel 21:21-22; 2 Kings 17:7; Jeremiah 14:14; Numbers 22:7; Numbers 23:23; Deuteronomy 18:10; 1 Samuel 15:23), usually through special techniques such as familiar spirits, worked up trances, examining entrails of a sacrifice and throwing sand on the ground. But the fact that here it is called ‘lying divination' seems to contrast it with the true reception of prophetic truth by men like Ezekiel (never directly called divination), obtained directly through Yahweh.
The result of the false visions and lying divination is that the people are deceived and expectant of something that will never materialise, will never ‘be confirmed' by fulfilment.