No claim, other than payments of principal of, premium, if any, or interest on bonds, shall be paid by the district treasurer until the claim has been allowed by the board, and only upon warrants signed by the president and countersigned by the secretary. If the treasurer does not have sufficient money on hand to pay a warrant when it is presented for payment, the treasurer shall endorse thereon “Not paid for want of funds” and the date when so presented, over the treasurer’s signature. All claims against the district must be certified the same as claims filed against a county. The board may require any claim to be verified. The secretary of the district may administer an oath to the person verifying a claim.