You will have to swear before the judge.

你必须在法官面前起誓。

youdao

The witnesses must swear before speaking.

证人在发言前必须宣誓。

youdao

I lean to swear before I learn to count.

我在会数数前就会骂人了。

youdao

The investigation into Coke's finances comes after US firms have been forced to swear before the regulator that their accounts are accurate.

BBC: Coke hits back in fraud probe

They are organising public ceremonies in which those suspected of malpractice by their neighbours are wrapped in white sheets, like corpses, and then asked to swear before the community that they have not been involved in black magic.

ECONOMIST: Indonesia

But be that as it may, they swear under oath in testimony before the judge who is trying the case on its merits, and A or B loses--whoever the loser--are they taken over to criminal court and charged for lying under oath and obstruction of justice?

CNN: Sen. Ernest Hollings' closed-door impeachment statement