Every counsellor at law or attorney at law, shall, before he is permitted to practice in any court of this state, take and subscribe in open court, the following oath:
I,, do solemnly promise and swear, that I will support the constitution of this state and the constitution of the United States and will perform the duties of my office faithfully to the best of my ability. So help me God.
N.J.S. § 2A:13-1