swear under oath

See: depose, testify
References in periodicals archive ?
However, the singer's lawyer reportedly has a witness who will swear under oath that Bieber didn't spit, but the DA also has a witness- aside from the alleged victim- who will testify that he saw the singer spitting in the guy's face.
I swear under oath that Afghan ladies have sent us messages for permission to take part in the jihad,'' Razaq said.
The Texas Public Utility Commission sought to prevent such illegal manipulation of the free market in Texas, and the state's three largest vertically-integrated energy companies -- TXU, AEP and Reliant -- all were forced to swear under oath that they would not engage in such illegal patterns and practices.