Argument from authority
From RationalWiki
An argument from authority is a rhetorical fallacy where it is argued that because one person or body says something is true, it must be. In many ways, it is the reverse of an ad hominem argument.[1] Implicit in the argument is the idea that because a person is a recognized expert in one area, he/she can speak with authority on almost anything.
Examples:
"The earth is 6000 years old because of the traced lineages in the Bible."
"It was right to go to war in Iraq because Dubya told us so."
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