King James Version
Seeing ye have purified your souls in obeying the truth through the Spirit unto unfeigned love of the brethren, see that ye love one another with a pure heart fervently:English Standard Version
Having purified your souls by your obedience to the truth for a sincere brotherly love, love one another earnestly from a pure heart,New International Version
Now that you have purified yourselves by obeying the truth so that you have sincere love for your brothers, love one another deeply, from the heart.