DEU 5:15

15 Have mind, that also thyself servedest in Egypt, and thy Lord God led thee out from thence, in a strong hand, and in an arm stretched forth; therefore he commanded to thee, that thou shouldest keep the sabbath day. (Remember, that thou were slaves in Egypt, and that the Lord thy God led thee out from there, with a strong hand, and an outstretched arm; and so he commanded thee, that thou should keep the Sabbath day.)