In the case of any real property sold as provided in section
6335 and not redeemed in the manner and within the time provided in section
6337, the Secretary shall execute (in accordance with the laws of the State in which such real property is situated pertaining to sales of real property under execution) to the purchaser of such real property at such sale, upon his surrender of the certificate of sale, a deed of the real property so purchased by him, reciting the facts set forth in the certificate.