Here you will find the Poem The Seventh Day of poet Yehudah HaLevi
Forget not the day of the Sabbath, Its mention is like a pleasant offering. During it the dove found resting place, And there the weary may relax. The day is honored by the Children of Faith, Careful to observe it are fathers and sons. Engraved upon two tablets of stone, From great power and mighty strength. And they all came in Covenant together, In unison they said, "We shall do and we shall listen." And they commenced and answered, "God is One," Blessed is He that gives strength to the weary. He spoke in His holiness by the mountain of Mohr spice "Remember and guard the seventh day." And all of his commandments to be completed together Strengthen the loins and gather up power. The nation that is in motion, like lost sheep, By covenant He will remember to recall it, So that an evil happening may not befall them, Just as You have sworn by the waters of Noah.