Bishop: All we know for sure is that he went to college with Amanda Kendall. His murder could be a coincidence.
Gibbs: McGee.
McGee: Rule 39, Bishop.
Bishop: Right. No such thing as a coincidence. I knew that one.

Always work as a team. (Season 5, Episode 5)

Rule #15

Ziva: I never intended to live through it.
Gibbs: You didn't. That part of you died out there.

Never, ever bother Gibbs in interrogation. (Season 4, Episode 10)

Rule #22

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

Rule #14

McGee: Red handed?
Gibbs: They don't come much redder.

You do what you have to for family.

Unwritten Rule

I've seen bad turn to good many times. You can't lose faith.

If feels like you're being played, you probably are. (Season 9, Episode 1)

Rule #36

Moore: I gotta ask you something.
Gibbs: No she's not married. She's not dating anybody.
Moore: How'd you know I--
Gibbs: A wild guess.

Gibbs: I had a daughter. She used to to sit right there at the table where you were. She took my pocket knife from me once. Knife wasn't a toy and she knew that. She climbed up here. And she took that knife and she carved her initials right in the back of that cabinet there. And lost the best pocket knife that I ever had.
Luke: What'd you do?
Gibbs: I scolded her. Grounded her. Then I forgave her.
Luke: I'm nothing. I'm nothing! Everyone hates me! Just kill me! That's what they want! That's what I want!

Vance: Blackmail Bayar to help us, DIA is none the wiser. That's the plan?
Gibbs: Yeah. You got a better one, Leon?
Vance: Word of advice, don't get caught.

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

Abby: It's okay. Breena's fine. Breathe. Good. Now hurry up and get to the hospital because Breena is in labor.
McGee: Jimmy? Did you hear what she said? She just said Breena's having a baby. I think you broke him.