On Mount Sinai almighty God spoke, and said: “Remember that thou keep holy the Sabbath day. Six days shalt thou labor and do all thy work” (Exod. xx. 8, 9). The Third Commandment thus contains two injunctions, the command to sanctify the Sunday, and the command to work.
In the Third Commandment of the Decalogue God commands us to sanctify the Sunday and to work six days in the week.