Exodus 31:15

The sabbath of rest, Heb. the sabbath of sabbaths, or, of sabbaths, i.e. the great and chief sabbath, as the song of songs is the most excellent song, the holy of holies is the most holy, &c. The Jews had many sabbaths or days of rest, but this is here preferred before them all, by this emphatical repetition of the same word; and by this argument the foregoing duty is pressed upon them.