N.Y. Local Finance Law § 84.00

§ 84.00 Effect of recital of validity in obligations. If the\nobligations issued pursuant to a resolution or certificate published in\nthe manner provided in this title contain a recital in substantially the\nform prescribed in section 52.00 of this chapter, such recital shall\nbind the municipality, school district or district corporation issuing\nsuch obligations, and twenty days after such resolution or certificate\nshall have been published and after such obligations have been purchased\nin good faith and for fair value by any person, the validity of such\nobligations shall not be questioned by such municipality, school\ndistrict or district corporation or any taxpayer thereof in any court.\n