N.H. Rev. Stat. § 311:6
Every attorney admitted to practice shall take and subscribe the oaths to support the constitution of this state and of the United States, and the oath of office in the following form: You solemnly swear or affirm that you will do no falsehood, nor consent that any be done in the court, and if you know of any, that you will give knowledge thereof to the justices of the court, or some of them, that it may be reformed; that you will not wittingly or willingly promote, sue or procure to be sued any false or unlawful suit, nor consent to the same; that you will delay no person for lucre or malice, and will act in the office of an attorney within the court according to the best of your learning and discretion, and with all good fidelity as well to the court as to your client. So help you God or under the pains and penalty of perjury. The supreme court shall have authority to determine by court rule the manner in which the oaths shall be administered.
RSA 311:6
RS 177:5. CS 187:5. GS 199:5. GL 218:5. PS 213:5. PL 325 :6. RL 381:6. RSA 311:6. 1995, 277:3. 2014, 204:46, eff. July 11, 2014.