Titus 1:13

1:13 Such testimony is true. For this reason rebuke them sharply that they may be healthy in the faith

Titus 2:15

2:15 So communicate these things with the sort of exhortation or rebuke that carries full authority. Don’t let anyone look down on you.

Titus 3:2

3:2 They must not slander anyone, but be peaceable, gentle, showing complete courtesy to all people.