Moses
Exodus 31:16ESV·traditional attribution

Therefore the people of Israel shall keep the Sabbath, observing the Sabbath throughout their generations, as a covenant forever.

Matthew Henry Presbyterian @wholebiblehenry

Here is, I. A strict command for the sanctification of the sabbath day, Exo 31:13-17. The law of the sabbath had been given them before any other law, by was of preparation (Exo 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 (Exo 23:12); and here it is added to...

Commenting on Exodus 31:12-18

John Gill Reformed Baptist @doctorgill

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...

Adam Clarke Methodist @methodicalclarke

A perpetual covenant - Because it is a sign of this future rest and blessedness, therefore the religious observance of it must be perpetually kept up. The type must continue in force till the antitype come.