|Never let suspects stay together.||Gibbs (to Kate): "Rule number one: Never let suspects stay together."||1.01 Yankee White|
|1||Never screw (over) your partner.||Gibbs: "Number one supersedes all of the others."|
Jenny: "Never screw your partner?"
Gibbs: "Never screw OVER your partner."
|2||Always wear gloves at a crime scene.||Gibbs (to Kate): "Rule number two: Always wear gloves at a crime scene."||1.01 Yankee White|
|3||Don't believe what you're told. Double check.||Gibbs: "Rule number three: Don't believe what you're told, double check."|
Kate: "Should I write these rules in my Palm Pilot or crochet them on pillows?"
|1.01 Yankee White|
|3||Never be unreachable.||Ziva (after trying to reach McGee): "Rule number three..."|
Tony: "Never be unreachable."
|4||If you have a secret, the best thing is to keep it to yourself. The second-best is to tell one other person if you must. There is no third best.||Jenny: "It's your fault you know."|
Gibbs: "For what, leaving or coming back?"
Jenny: "For teaching me your rules. Best way to keep a secret, keep it to yourself. Second best, tell one other person... if you must. There is no third best. (walking away) That's rule number four isn't it?"
|5||You don't waste good.||8.22 Baltimore|
|6||Never say you're sorry. It's a sign of weakness.||Gibbs (to Kate): "Never say you're sorry. (laughing) You don't have to crochet that one."|
Tony (to Gibbs): I broke rule #6. Never say you're sorry.
Gibbs: It was covered by rule #18.
|1.01 Yankee White|
7.12 Flesh & Blood
|7||Always be specific when you lie.||Gibbs (to Kate): "Rule number seven: Always be specific when you lie."||1.23 Reveille|
|8||Never take anything for granted.||Abby (to McGee): "Rule number eight is gonna save you McGee!"|
Tony: "Never date a co-worker? "
Ziva (to Tony): "Never go anywhere without your knife. "
Tony (to Ziva): "Thought that was nine."
Gibbs: "Never take anything for granted."
Abby (to Gibbs): "Correct El Jefe. But then again you did make up the rules."
Ziva: "I assume Gibbs would have checked that out last night."
Tony: "Rule number eight: Never assume anything."
Ziva: "To be precise it's, ah, never take anything for granted."
|3.10 - Probie|
3.17 - Ravenous
|9||Never go anywhere without a knife.|
Gibbs (while handing his knife to Tony): "Rule number nine:"Gibbs & Kate (in unison): "Never go anywhere without a knife."
Tony: "Rule nine."
Tony: "Ya know those rule they teach you guys in the Marine Corps."
Atlas: "What rules?"
Tony: "Huh, I always suspected the fact that Gibbs was making that stuff up. Well... rule nine is, ah (undoing his belt), never go anywhere (pulling out his knife) without a knife."
Abby: Rule #9 'always keep a spare'.Tony: I thought Gibbs said nine was 'always carry a knife.'
Abby: Not Gibbs' rules...mine.
|1.13 - One Shot, One Kill|
1.20 - Missing
3.22 - Jeopardy
|10||Never get personally involved in a case.||Gibbs: You okay?|
Tony: Not really. I broke rule number ten. Again. Never get personally involved in a case.
Gibbs: Yeah. That's the rule I've always had the most trouble with.
|11||When the job is done, walk away.||Gibbs: "Rule number eleven, DiNozzo."|
Tony: "I would never date a co-worker boss. Trust me. I mean, why would you even—that's twelve. Eleven... when the job is done, you walk away."
|6.24 Semper Fidelis|
|12||Never date a coworker.||Kate (to Tony): "Not my style, Tony. I would just shoot you." |
Gibbs (just walking in): "That would be the reason for rule number twelve."
Kate: "Rule twelve?"
Gibbs: "Never date a co-worker."
|13||Never, ever involve lawyers.|
Tony: "Which means you've been here one day and already broken Gibbs' rule number thirteen."
Dwayne: "Rule number thirteen?"
Tony: "Yeah, rule number thirteen: Never, ever involve lawyers. Things are bound to turn nasty."
|6.07 Collateral Damage|
|15||Always work as a team.||Jenny: "I heard your agents are pitted against each other. Wasn't that Gibbs' rule number fifteen? Always work as a team."|
Gibbs: "Not on this one."
|5.05 Leap of Faith|
|16||If someone thinks they have the upper hand, break it.||8.24 Pyramid|
|18||It's better to ask forgiveness than ask permission.||Jenny (to Gibbs): "Number eighteen: It's better to seek forgiveness than ask permission."||3.04 Silver War|
|22||Never, ever interrupt Gibbs in interrogation.||Tony (to Ziva): "Rule number twenty-two: never, EVER bother Gibbs in interrogation."||4.10 Smoked|
|23||Never mess with a Marine's coffee if you want to live.||Kate (to Tony): "Maybe next time you should remember rule... twenty-three..."|
Marine (laughing): "Never mess with a Marine's coffee if you want to live."
|2.09 Forced Entry|
|27||There are two ways to follow someone. ||7.15 Jack Knife|
7.24 - Rule Fifty-One (on a piece of paper in Jethro's home)
|35||Always watch the watchers.||8.22 Baltimore|
|38||Your case, your lead.||Gibbs (to Tony): "Your case, your lead. I think it's a rule."||6.16 Bounce|
|39||There is no such thing as coincidence.||7.21 Obsession|
|40||If it seems like someone's out to get you, they are.||Gibbs (to Abby): "Rule forty."|
Abby (to Gibbs): "If you think someone is out to get you, they are."
|44||First things first, hide the women and children.||Gibbs (to Camila Charo to tell Mike Franks): "Tell him Rule 44"|
Shannon (to Gibbs): "Forty-four. First things first, Hide the women and children. You're actually writing these down?"
|7.23 Patriot Down|
7.24 Rule Fifty-One
|45||Clean up your messes.||Tony (to Gibbs): "Where are you gonna be?"|
Gibbs (to Tony): "At the mess I gotta clean up."
Tony (whispers to Ziva): "That's 45 ... basically."
|7.24 Rule Fifty-One|
|51||Sometimes - you're wrong.||Gibbs (written after reminiscing about his wife and his rules)||7.24 Rule Fifty-One|