Moses
Exodus 16:29ESV·traditional attribution

See! The LORD has given you the Sabbath; therefore on the sixth day he gives you bread for two days. Remain each of you in his place; let no one go out of his place on the seventh day.”

Matthew Henry Presbyterian @wholebiblehenry

We have here, 1. A plain intimation of the observing of a seventh day sabbath, not only before the giving of the law upon Mount Sinai, but before the bringing of Israel out of Egypt, and therefore, from the beginning, Gen 2:3.

Commenting on Exodus 16:22-31

John Gill Reformed Baptist @doctorgill

So the people rested on the seventh day. Did not attempt to go out of their tents in quest of manna, as on other days, and observed it as a day of rest from labour, and so they continued to do in successive generations. So the people rested on the seventh day.

Adam Clarke Methodist @methodicalclarke

Abide ye every man in his place - Neither go out to seek manna nor for any other purpose; rest at home and devote your time to religious exercises. Several of the Jews understood by place in the text, the camp, and have generally supposed that no man should go out of the place, i.e., the city, town, or village in which he resides, any...