Mass. Gen. Laws ch. 45, § 23: Limitation on use of funds

Section 23. No land shall be taken or purchased for a public domain, no building erected thereon and no expenditures authorized or made or liability incurred therefor until an amount sufficient to cover the estimated expense thereof has been appropriated therefor as provided in section nineteen, and all contracts made for expenditures in excess thereof shall be void. The expenditures shall not exceed the appropriations therefor.