Pakistan Legal Practitioners and Bar Councils Rules, 1976 — section 169

169. An advocate should always treat adverse witnesses and parties with fairness and due consideration, and he should never minister to the malevolence of prejudices of a client in the trial or conduct of a cause. The client cannot be made the keeper of the advocate's conscience in professional matters. He has no right to demand that his advocate shall abuse the opposite party or indulge in offensive arguments. Improper speech is not excusable on the ground that it is what the client would say if speaking in his own behalf.