I swear to tell the truth, the whole truth, and nothing but the truth.

我发誓说出真相，整个真相，完完全全的真相。

youdao

Do you swear to tell the truth, the whole truth, and nothing but the truth?

你敢发誓说出真相，整个真相，而绝不撒谎了吗？

youdao

I swear to tell the truth, the whole truth, and nothing but the truth, so help me god.

我发誓，我所说的是真实，尽其所实，即所述之言纯属实言并且无任何隐瞒。

youdao

In a court proceeding, do you assume some trivial responsibility when you raise your right hand, and swear to God to tell the truth, the whole truth, and nothing but the truth?

CNN: Transcript: Chairman Hyde's opening statement

Witnesses in trials swear under oath to 'tell the truth, the whole truth, and nothing but the truth.

CNN: Sen. Allard's closed-door impeachment statement