Titus 3:8-11

8This is a faithful saying, and these things I will that thou affirm constantly, that they who have believed in God may be careful to maintain good works. These things are good and profitable to men.

9But avoid foolish questions, and genealogies, and contentions, and strivings about the law; for they are unprofitable and vain. 10A man that is an heretic after the first and second admonition reject; 11Knowing that he who is such is subverted, and sinneth, being condemned by himself.