Charles Ellicott Commentary Daniel 2:9

"But if ye make not known unto me the dream, there is but one law for you; for ye have prepared lying and corrupt words to speak before me, till the time be changed: therefore tell me the dream, and I shall know that ye can show me the interpretation thereof." — Daniel 2:9 (ASV)

There is but one decree.— He refers to the decree mentioned in Daniel 2:5, that both the dream and its interpretation must be told. These two things must go together, for they form the subject of one decree.

Ye have prepared ... be changed — that is, “you have made an agreement among yourselves to postpone the matter until a more lucky time for explaining the dream shall come.” On Eastern notions about fortunate days, compare Esther 3:7 and the standard inscription or Nebuchadnezzar towards the end.