When Agent David yells "Ben kelev", that is roughly translated to "son of a bitch".
At the beginning of the episode Ziva picks up the dress she wore in "Under Covers" (3.8), Tony wears the disguise from "Driven" (4.11) when he was working secretly for Jenny which is why Ziva and McGee did not recognise it.
Shabbat Shalom roughly translates to "Sabbath of peace."