WSC Q.53: Which is the third commandment?
The third commandment is, Thou shalt not take the name of the Lord thy God in vain; for the Lord will not hold him guiltless that taketh his name in vain. (Exod. 20:7)
WLC Q.111: Which is the third commandment?
The third commandment is, Thou shalt not take the name of the Lord thy God in vain: for the Lord will not hold him guiltless that taketh his name in vain. (Exod. 20:7)