King James Version
This I say therefore, and testify in the Lord, that ye henceforth walk not as other Gentiles walk, in the vanity of their mind,English Standard Version
Now this I say and testify in the Lord, that you must no longer walk as the Gentiles do, in the futility of their minds.Catholic Public Domain Version
And so, I say this, and I testify in the Lord: that from now on you should walk, not as the Gentiles also walk, in the vanity of their mind