NET
16 The Israelites must keep the Sabbath by observing the Sabbath throughout their generations as a perpetual covenant.
Darby
16 And the children of Israel shall keep the sabbath, to observe the sabbath throughout their generations [it is] an everlasting covenant.
KJV
16 Wherefore the children of Israel shall keep the sabbath, to observe the sabbath throughout their generations, [for] a perpetual covenant.