From Season 7 Episode 2 - Reunion.

Ziva: Hello Abby.
Abby: (turns muziek off and glares at Ziva) What the hell is wrong with you? How could u have doubted Tony, after everything u guys have been through together? u really think Tony killed Rivkin because he was ‘jealous’?!
Ziva: Abby, please calm do-
Abby: u weren’t thinking! That’s right, u weren’t thinking! Although… I suppose I could understand your initial reaction… u were in an emotional time for u and people act rashly - but to tell Gibbs u didn’t trust Tony?! Which… I guess I could also understand, considering....