2 Timothy 4:2 NIV

1 Timothy 4:13 NIV
Until I come, devote yourself to the public reading of Scripture, to preaching and to teaching.

1 Timothy 4:15-16 NIV
Be diligent in these matters; give yourself wholly to them, so that everyone may see your progress. Watch your life and doctrine closely. Persevere in them, because if you do, you will save both yourself and your hearers.

Titus 1:13 NIV
This saying is true. Therefore rebuke them sharply, so that they will be sound in the faith

Titus 2:15 NIV
These, then, are the things you should teach. Encourage and rebuke with all authority. Do not let anyone despise you.