'Polluting' in the Bible

O the happiness of a man who doth this, And of a son of man who keepeth hold on it, Keeping the sabbath from polluting it, And keeping his hand from doing any evil.

And sons of the stranger, who are joined to Jehovah, To serve Him, and to love the name of Jehovah, To be to Him for servants, Every keeper of the sabbath from polluting it, And those keeping hold on My covenant.