Язычок введет в грешок

See Кто много болтает, тот много врет (К)

Cf: Не cannot speak well that cannot hold his tongue (Am.). Не who talks much errs much (makes many mistakes) (Am.). In a multitude of words there wants not sin (Am.). Much talking, much erring (Am.). Talk much and err much (Am.). Talk much, err much (Br.)