John Gills Exposition of the Bible Commentary - Deuteronomy 5:12-13
Keep the sabbath day to sanctify it ,.... Or observe it, by setting it apart as a time of natural rest, and for the performance of holy and religious exercises; see Exodus 20:8 , where the phrase is a little varied, "remember the sabbath day to keep it holy"; it having been instituted before: as the Lord thy God hath commanded thee ; not at Sinai only, for the same might then have been observed of all the rest of the commands, but before the giving of the law, at the first of the... read more
Matthew Henry's Complete Commentary - Deuteronomy 5:6-22
Here is the repetition of the ten commandments, in which observe, 1. Though they had been spoken before, and written, yet they are again rehearsed; for precept must be upon precept, and line upon line, and all little enough to keep the word of God in our minds and to preserve and renew the impressions of it. We have need to have the same things often inculcated upon us. See Phil. 3:1. 2. There is some variation here from that record (Exod. 20:1-26), as there is between the Lord's prayer as it... read more