Exodus 31:16

Exo 31:16 Wherefore the children of Israel shall keep the sabbath, to observe the sabbath throughout their generations, [for] a perpetual covenant.

Ver. 16. For a perpetual covenant. ] So the Sabbath is called by way of eminency; as if nothing of God’s covenant were kept, if this were not Philo Judaeus saith, The fourth commandment is a famous precept, and profitable to excite all kind of virtue and piety.