'Pure' in the Bible

Evil devices are an abomination to Jehovah; But pleasant words are pure.

Who can say, I have made my heart clean, I am pure from my sin?

Even a child maketh himself known by his doings, Whether his work be pure, and whether it be right.

The way of him that is laden with guilt is exceeding crooked; But as for the pure, his work is right.

There is a generation that are pure in their own eyes, And yet are not washed from their filthiness.