Acts 26:25

But he said, "I am not mad, most noble Festus, but speak the words of truth and reason.

Surrounding context

26:24 Now as he thus made his defense, Festus said with a loud voice, "Paul, you are beside yourself! Much learning is driving you mad!"

26:25 But he said, "I am not mad, most noble Festus, but speak the words of truth and reason.

26:26 For the king, before whom I also speak freely, knows these things; for I am convinced that none of these things escapes his attention, since this thing was not done in a corner.

Translation and sources