You don't waste good. (Season 8, Episode 22)

Rule #5

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Never apologize. (Season 7, Episode 12, but referenced previous times without a number attached)

Rule #6

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Always be specific when you lie. (Season 1, Episode 23)

Rule #7

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Never take anything for granted. (Season 3, Episode 10)

Rule #8

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Never assume. (Season 9, Episode 21)

Rule #8

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Never go anywhere without a knife. (Season 1, Episode 13)

Rule #9

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Never get personally involved on a case. (Season 7, Episode 21)

Rule #10

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When the job is done, walk away. (Season 6, Episode 24)

Rule #11

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Never date a coworker. (Season 1, Episode 15, and referenced on other occasions)

Rule #12

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Never, ever involve a lawyer. (Season 6, Episode 7; Gibbs is said to have other rules involving lawyers, but according to Tony, this is the "umbrella" one)

Rule #13

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Bend the line, don't break it. (Season 11, Episode 4)

Rule #14

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Gibbs: (as he and Quinn look at the Vietnam Memorial Wall) No matter how many times I come here, it still gets to me. You look at a name, and you have to look at a reflection of yourself. You are among the fallen.
Quinn: Yeah. Difference is, you can leave. The names don't.

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