Exodus 20:16 (King James Bible) thou shalt not bear false witness against thy neighbor
Here the 1858 Wright edition accidentally replaced thou shalt with thou shall; a similar instance of this error, also confined to a single edition, is found nearby in Mosiah 13:17. The critical text will, of course, retain the standard biblical thou shalt here in Mosiah 13:23 and generally elsewhere. For a more complete discussion, see under Mosiah 12:11.
Summary: Maintain the use of shalt in “thou shalt not bear false witness”.