(1) Every person offered as a witness, before any testimony shall be given by him, shall be duly sworn that the evidence he shall give relating to the matter between, plaintiff, and, defendant, shall be the truth, the whole truth, and nothing but the truth.
(2) If a witness, on being produced, shall be objected to as incompetent, or his testimony, when offered, shall be objected to as irrelevant, the objections shall be heard and determined by the justice.