Persons scrupulous of swearing may affirm; the word "affirm" being used in administering the oath, instead of the word "swear," and the words "this you do under the pains and penalties of perjury," instead of the words "So help you God."
N.H. Rev. Stat. Ann. § 516:20
Affirmation
Source
Official source: New Hampshire General Court. Reproduced from public-domain New Hampshire statutes; confirm against the official source for the current text. Not legal advice.