Here the 1879 LDS edition is missing the to of “according to that which is written”. It is rather amazing that this obvious typo was maintained so long in the LDS text, being reproduced in three subsequent LDS editions (the 1888 and 1906 large-print editions as well as the 1902 Kansas City edition). In any event, this typo was finally corrected in the 1905 Chicago edition.
Summary: Maintain in 2 Nephi 29:11 the necessary to in “according to that which is written”.