Exodus 31:16

“Wherefore the children of Israel shall keep the sabbath, etc.] 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 covenant; just in the same sense as circumcision was, (<011713>Genesis 17:13).”

“The penal law of the Sabbath. Exodus 35:2-3. In the fourth commandment the injunction to observe the seventh day is addressed to the conscience of the people (see Exodus 20:8 note): in this place, the object is to declare an infraction of the commandment to be a capital offence. The two passages stand in a relation to each other similar to that between Leviticus 18:0, Leviticus 19:0, and Leviticus 20:0. It seems likely that the penal edict was especially introduced as a caution in reference to the construction of the tabernacle, lest the people, in their zeal to carry on the work, should be tempted to break the divine law for the observance of the day. Exodus 31:14 See Numbers 15:32-36. The…”

“It was to be observed throughout their generations, in every age, for a perpetual covenant - This was to be one of the most lasting tokens of the covenant between God and Israel. Exodus 31:17”

“a perpetual covenant: Gen 9:13, Gen 17:11; Jer 50:5 Exodus 31:17”