Exodus 20:9 (King James Bible) six days shalt thou labor
Here the 1874 RLDS edition accidentally replaced shalt thou with shall thou. The subsequent RLDS edition (in 1892) restored the correct reading. For further discussion of the tendency in the text to replace shalt with shall, see under Mosiah 12:11. For a similar example in this chapter, see Mosiah 13:23.
Summary: Maintain in Mosiah 13:17 the use of shalt in “six days shalt thou labor”, the reading of the earliest textual sources.