Did I hear right? no oath for for General Petraeus today at the hearing? It is routine that witnesses take an oath

I am curious why the Former Director of the CIA, who has given either wrong information on September 14 th or, at best, misleading, to Congress…….this time (per Congressman Peter King – unless I heard wrong) was questioned at a hearing without requiring an oath?   What’s with that?  What is the explanation for no oath?