Read Exodus 31:16 Using Other Translations
Wherefore the children of Israel shall keep the sabbath, to observe the sabbath throughout their generations, for a perpetual covenant.
Therefore the people of Israel shall keep the Sabbath, observing the Sabbath throughout their generations, as a covenant forever.
The people of Israel must keep the Sabbath day by observing it from generation to generation. This is a covenant obligation for all time.