Massachusetts General Laws Part III. Courts, Judicial Officers and Proceedings in Civil Cases (Ch. 211-262) Ch. 239, § 6A

If the action is for the possession of land after foreclosure of a tax title thereon, the condition of the bond shall be for the entry of the action and payment to the plaintiff, if final judgment is in his favor, of all costs and of a reasonable amount as rent of the land from the day when the tax title was foreclosed until possession of the land is obtained by the plaintiff, and of all damage and loss which he may sustain by the withholding of possession of the land or tenements demanded and by any injury done thereto during such withholding.