Who said "A word once spoken can never be taken back."?

This quote is attributed to King Azaz.

A word once spoken can never be taken back. - King Azaz

"A word once spoken can never be taken back."

King Azaz

Character in The Phantom Tollbooth

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"Words can be commended, debased, or ignored, but they cannot be reversed."

"You can never be too careful when choosing the words you use."

"Words are such wonderful things."

"Let me see your mind."