letter of the law

letter of the law idiom
The precise wording rather than the spirit or intent. For example, Since it was the first time he'd broken the rules, the school decided to ignore the letter of the law and just give him a warning. [Late 1500s]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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