Say
As with many common verbs, the meaning of “to say” in the Bible is highly dependent on context. Who is speaking? Who is hearing? What is it about? Is it a command, a message, an apology, instruction? All these things enter into the meaning of “say.” In general, though, “saying” has to do with sharing truth at various levels -- from the most exalted power people can have to perceive the Lord's desires directly to the most basic of orders issued to people at their lowest.
Fire from heaven
In Revelation 13:13, this demonstrates how their falsities were heavenly truths. It is also a sign testifying that they were in evils and thence in falsities. (Apocalypse Revealed 599)