And God finished on the sixth day his works which he made, and he ceased on the seventh day from all his works which he made.
Genesis 2:2, Septuagint
And God blessed the seventh day and sanctified it, because in it he ceased from all his works which God began to do.
Genesis 2:3, Septuagint
And the children of Israel shall keep the sabbaths, to observe them throughout their generations.
Exodus 31:16, Septuagint
It is a perpetual covenant with me and the children of Israel, it is a perpetual sign with me; for in six days the Lord made the heaven and the earth, and on the seventh day he ceased, and rested.