Deuteronomy 10:20 "And swear by His name"
In court, when the defendant is called to the stand, he or she is questioned
again and again by the lawyers and the judge.
The defendant tries to convince the jury that he is not guilty of the crime
he is charged with. The judge demands that he swear he is telling the truth.
The defendant chooses to swear by something he holds to be sacred and
important. He hopes this will impress the jury of his sincerity and innocence.
In a Beit Din, a Jew may also be required to take an oath confirming that he
is telling the truth.
When taking an oath, he is commanded to swear by the name of HaShem. He will
be using HaShem's holy name to convince the court of his honesty.