To the Jews who had believed him, Jesus said, "If you hold to my teaching, you are really my disciples." (NIV)

So Jesus said to those Jews who had believed in Him, If you abide in My word [hold fast to My teachings and live in accordance with them], you are truly My disciples. (AMP)

Then said Jesus to those Jews which believed on him, If ye continue in my word, then are ye my disciples indeed; (KJV)