Albert Barnes' Notes on the Whole Bible - Exodus 16:23
Tomorrow ... - Or, Tomorrow is a rest, a Sabbath holy to Yahweh: i. e. tomorrow must be a day of rest, observed strictly as a Sabbath, or festal rest, holy to Jehovah.Bake ... - These directions show that the manna thus given differed essentially from the natural product. Here and in Numbers 11:8 it is treated in a way which shows that it had the property of grain, could be ground in a mortar, baked and boiled. Ordinary manna is used as honey, it cannot be ground, and it melts when exposed to a... read more
The Pulpit Commentary - Exodus 16:23-30
The institution of the Sabbath. That, in some sense, the Sabbath was instituted in Paradise seems to follow from Genesis 2:3 . It was at any rate then set apart by Divine counsel and decree. And it is quite possible that a revelation of its sanctity was made to Adam. The week of seven days may, however, have arisen simply out of the lunar month, the four weeks corresponding to the moon's four phases. In any case, as the early Egyptians had no such institution as a weekly sabbath, and... read more