John Gill Commentary Daniel 4:7

"Then came in the magicians, the enchanters, the Chaldeans, and the soothsayers; and I told the dream before them; but they did not make known unto me the interpretation thereof." — Daniel 4:7 (ASV)

Then came in the magicians, the astrologers, the Chaldeans,
and the soothsayers (See Gill on Daniel 2:2), and I told the dream before them, but
me the interpretation thereof ;
because they could not; before they pretended, if the dream was told, they could give the interpretation of it; but now, though it was told, they could not do it; which shows the vanity of their art, the falsehood of their pretensions, and that they were but jugglers and impostors.