King James Version (KJV)
If ye had known me, ye should have known my Father also: and from henceforth ye know him, and have seen him.
English Standard Version (ESV)
If you had known me, you would have known my Father also. From now on you do know him and have seen him.
New International Version (NIV)
If you really know me, you will know my Father as well. From now on, you do know him and have seen him.