The Clone Wars - S1E16 - "The Hidden Enemy"

7:48 - Anakin:  "This is a trap!"  He says this as he knowingly goes into it, so the situation is a bit different, but this does recall Ackbar's famous "It's a trap!" in Return of the Jedi [1:35:03] and Leia's in The Empire Strikes Back [1:39:50].