From: The Mandalorian
Genre: Movies
Who said it?: Kuill
The story behind the quote: For such a short series, The Mandalorian already has a couple of good quotes worth mentioning! This week’s quote comes from the Disney+ exclusive series set in the Star Wars universe. The Mandalorian follows the titular character (portrayed by Pedro Pascal) throughout the galaxy with a young child of Yoda species, who fans have dubbed Baby Yoda.
The quote is given by a character named Kuill (played by Nick Nolte). The character becomes an acquaintance of the Mandalorian and, whenever he proclaims something that will be done, he delivers the quote to punctuate it.
Geek wisdom: When you say you will do something, you have to stand by it and follow through.
My Geek Wisdom 
I believe “I have spoken” is derived from the Southern version, “Ah has spoken!”, seen in the Li’l Abner comic strip in the mid 20th Century. Whether the Mandalorian writers got it from there, only they know…
This came originally from Edgar Rice Burroughs. A geek should know this. 🤣