John Gills Exposition of the Bible Commentary - Exodus 31:16
Wherefore the children of Israel shall keep the sabbath ,.... On whom the sabbath of the seventh day was only enjoined, as well as that of the seventh and of the fiftieth years, being all ceremonial and shadowy: to observe the sabbath throughout their generations ; so long as the Mosaic dispensation lasted, and their civil polity and church state continued, even until the Messiah came, when all those Jewish shadows, rites, and ceremonies, fled away and disappeared: for a perpetual... read more
Matthew Henry's Complete Commentary - Exodus 31:12-18
Here is, I. A strict command for the sanctification of the sabbath day, Exod. 31:13-17. The law of the sabbath had been given them before any other law, by was of preparation (Exod. 16:23); it had been inserted in the body of the moral law, in the fourth commandment; it had been annexed to the judicial law (Exod. 23:12); and here it is added to the first part of the ceremonial law, because the observance of the sabbath is indeed the hem and hedge of the whole law; where no conscience is made... read more