Psalms 139:20

For they speak against thee wickedly - This is one form or manifestation of their character as wicked people, that they speak maliciously against God. The psalmist, therefore, desired to have nothing to do with them. It is always a sufficient reason for avoiding the society, the friendship, and the fellowship of others, when they profane, blaspheme, or calumniate the name of God. From such men we should at once withdraw. Piety shrinks from the society of such men, whatever may be their rank, or their social qualities, and turns away in pain, in sorrow, in abhorrence. See the notes at Psalms 26:9.

And thine enemies take thy name in vain - It is proof that they are thine enemies that they take thy name in vain, or that they are profane men; it is a sufficient reason for desiring to be separated from them.