Oath
An oath, vow, pledge, or promise was a solemn sworn statement made by an individual.

In 2365, Commander William T. Riker promised to serve the  and obey Captain Kargan. When the Klingon asked if he would take an oath to that effect, Riker replied that he just did. ()

In 2375, General Martok felt that challenging Gowron would be dishonorable. Worf assured Martok that if he took the position of Chancellor of the Klingon High Council, "every warrior from here to Kronos would swear an oath to you." The Klingon High Council would subsequently have to accept him. ()

To be under oath in a court setting was to promise to tell the truth. In 2367, an imposter masquerading as Ardra reminded Acost Jared that he was under oath when asking if there was any doubt in his mind whether her intervention in Ventax II's affairs was responsible for improving living conditions on that planet. ()

In approximately 3074,  stated the most he could promise was to keep an open mind while listening to The Doctor's EMH backup module talk about what really happened seven hundred years before with the . ()

Oaths and vows 
Blood oath
Captain's Oath
Hippocratic Oath
Klingon oath
Marriage vows
Oath of non-interference
Oath of allegiance / Loyalty oath
Oath of celibacy
Oath of silence / Vow of silence
Oath of secrecy / Vow of secrecy
Starfleet oath
Vow of abstinence
Vow of obedience

External links 
 
 
 
 
Legal procedures