From Season 7 Episode 2 - Reunion.

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