A word (once) spoken is past recalling proverb
Retracting one's words or negating their effects once they have been spoken is impossible.
I know that a word once spoken is past recalling, so I carefully considered what I said when I stood before the council.
You'd better shut up, and from now on, think twice before saying stupid things. A word once spoken is past recalling!
Remember that a word once spoken is past recalling, so next time, before you intend to say something, you should certainly think twice.
The origin of this proverb is not clear.