Appeal from a judgment of the Supreme Court, Suffolk County, dated June 21, 1978, which, inter alia, held that the action of the appellant in withholding petitioner's pay during a period of suspension was "arbitrary, capricious and illegal." Judgment affirmed, with costs. Since this proceeding seeks the vindication of a private rather than public right, the filing of a verified notice of claim was a condition precedent to its maintenance (Education Law, § 3813, subd 1; Union Free School Dist. No. 6 of Towns of Islip Smithtown v. New York State Human Rights Appeal Bd., 35 N.Y.2d 371, 379-380; but see Ruocco v. Doyle, 38 A.D.2d 132 [not observing the distinction where the relief sought was equitable in nature]). The petitioner's attorney informed the school board by letter that its withholding of petitioner's salary was illegal. This notice was sent within 90 days of the school board's action, and informed the board that unless petitioner's back pay was forthcoming, this proceeding would be commenced. Although the letter was not verified, the court has the power to permit the claim to be amended by supplying the omitted verification (McCullough v. Board of Educ., 11 A.D.2d 740). Since the petition by which this proceeding was commenced was verified, was served within three months of the accrual of the claim, and contained the material allegations on which the claim was based, such permission should have been granted. As to the merits of the claim, it is well settled that a tenured teacher may not be suspended without pay pending final determination of charges filed against him pursuant to section 3020-a Educ. of the Education Law (Matter of Jerry v. Board of Educ., 35 N.Y.2d 534). If the teacher obstructs the proceedings, or obtains frivolous adjournments in bad faith, then he will forfeit his salary for the period of the delay (cf. Matter of Yeampierre v. Gutman, 52 A.D.2d 608). However, the burden of proving this fact lies with the school board (cf. Matter of Yeampierre v. Gutman, supra). On the record before us, the school board has failed to establish that petitioner sought to delay the proceedings or that he acted in bad faith. Damiani, J.P., Gulotta, Margett and Mangano, JJ., concur.