It is the duty of an attorney and counselor at law to abstain from all offensive personalities and to advance no fact prejudicial to the honor or reputation of a party or witness unless required by the justice of the cause with which he is charged.

Source: PolC 1877, ch 18, § 4, subdiv 5; CL 1887, § 465, subdiv 5; RPolC 1903, § 697, subdiv 5; RC 1919, § 5262 (5); Supreme Court Rule 13, 1939; SDC 1939 & Supp 1960, § 32.1201 (5).