John 8:31

Then said Jesus to those Jews which believed on him, If ye continue in my word, then are ye my disciples indeed;
— John 8:31, King James Version

In other translations

World English Bible (WEB)

Jesus therefore said to those Jews who had believed him, "If you remain in my word, then you are truly my disciples.

American Standard Version (ASV)

Jesus therefore said to those Jews that had believed him, If ye abide in my word, then are ye truly my disciples;

Young's Literal Translation (YLT)

Jesus, therefore, said unto the Jews who believed in him, 'If ye may remain in my word, truly my disciples ye are, and ye shall know the truth,