1 Timothy 1:6,7
From which some having swerved have turned aside to vain jangling;
Nave's Topical Index—AKJV

1 Timothy 6:20
O Timothy, keep that which is committed to your trust, avoiding profane and vain babblings, and oppositions of science falsely so called:
Nave's Topical Index—AKJV

2 Timothy 2:14,16
Of these things put them in remembrance, charging them before the Lord that they strive not about words to no profit, but to the subverting of the hearers.
Nave's Topical Index—AKJV

Titus 3:9
But avoid foolish questions, and genealogies, and contentions, and strivings about the law; for they are unprofitable and vain.
Nave's Topical Index—AKJV