Proverbs 18:21 — Life and death are in the power of the tongue.
There is an interesting story in the book of Judges, where Jephthah framed an interesting strategy to annihilate and route the Ephramites who constantly provoked him. He used the word, "SHIBBOLETH", to identify and corner them and the whole plot is a very interesting read. 42,000 men lost their lives just because they were not able to pronounce the word correctly.
This is taken from my book, "10 Pragmatic Leadership Principles from the Bible", where I discuss the importance of words, especially for leaders. Here's the video where I explain the chapter and below that is the excerpt of the chapter.
For the full excerpt of Chapter 1, visit - https://johnmanoah.medium.com/leaders-watch-your-words-62407dba73fb