Section 10

No omission to take any oath or make any affirmation, no substitution of any one for any other of them, and no irregularity whatever in the form in which anyone of them is administered, shall invalidate any proceeding or render inadmissible any evidence whatever in or in respect of which such omission, substitution or irregularity took place, or shall affect the obligation of a witness to state the truth.

Persons giving evidence bound to state the truth.