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

Rule #6

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

Rule #5

The best way to keep a secret? Keep it to yourself. Second best? Tell one other person, if you must. There is no third best. (Season 4, Episode 11)

Rule #4

Never be unreachable. (Season 3, Episode 13, Gibbs)

Rule #3

Never screw over your partner. (Season 4, Episode 14, Gibbs)

Rule #1

Mann: It's been six years. You must have something to say.
Gibbs: No, no I'm good.
Mann: Hmm.
Gibbs: If you want to talk, you should ride with DiNozzo.

Bishop: Should we go to the hospital?
Gibbs: No. No, we should find Parsa.
Bishop: How?
Gibbs: You start at the beginning, Bishop. Come on. This is what you do. Come on, come on, come on. Bishop. Come on! Get to work.
Bishop: Okay.
Gibbs: You find him. Get this son of a bitch.

Tony: You just have to move on. You made a mistake.
Bishop; A big mistake.
Gibbs: Learn from it. Move on.
Bishop: I will, Gibbs. Eventually.
Gibbs: Soon, Bishop. For your own good.

Gibbs: You want to make her sick?
Comey: It's stupid, I know, but I figured if I helped her feel better again, she might appreciate me more.
Bishop: That's not stupid at all.
Comey: The thing is, I'm still working on the whole cure part. I didn't want to get her sick without that. I'm not a monster, after all.

Tony: Wow. Wowsers.
Diane: This is not what it looks like.
Fornell: Right. We were just...
Gibbs: No. I do not need the details.
Tony: I wouldn't mind a few details.

Bank manager: Would you like something to drink?
Gibbs: No. I'm good.
Diane: I'll take a water. One straw, two pieces of ice, three slices of lemon.

Bishop: I mean, I might have a better idea. Look, Eddie is coming back. If he was ditching his car, there are easier places to abandon it than at an airport. We should put it back and watch it. And when he comes to pick it up----
Gibbs: We grab him.
Bishop: Absolutely not. We follow him, see what he does, where he goes, then we grab him.
Gibbs: Works for me.

NCIS Quotes

[voiceover] Anyone can achieve their fullest potential, who we are might be predetermined, but the path we follow is always of our own choosing. We should never allow our fears or the expectations of others to set the frontiers of our destiny. Your destiny can't be changed but, it can be challenged. Every man is born as many men and dies as a single one.

McGee

High-tech case - low-tech ass-kickin'!

Tony