At the top of this page...
... is a link to Firearms Safety. There you will find a version (one of literally dozens) of the firearms safety mantra. The 'Commandment' you quote is a form of Rule II in that incarnation. There are many, many other versions; some have only 3 'rules', others have as many as 10 or more. Google 'rules of firearms safety' and take your pick.
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