Massachusetts General Laws Part III. Courts, Judicial Officers and Proceedings in Civil Cases (Ch. 211-262) Ch. 244, § 22

The person entitled to redeem may, before the expiration of the three years limited for redemption, and before or after an entry for breach of condition, and before a sale pursuant to a power contained in the mortgage, commence suit for redemption without previous tender, and may in such suit offer to pay such amount as shall be found due from him, or to perform such other condition as the case may require; but a mortgagee who has published a notice of sale prior to the commencement of such suit may proceed with said sale unless the amount due is paid into court or the sale enjoined.