Sirach 1:29

29 Be not an hypocrite in the sight of men, and take good heed what thou speakest.

Sirach 1:29 In-Context

27 For the fear of the Lord is wisdom and instruction: and faith and meekness are his delight.
28 Distrust not the fear of the Lord when thou art poor: and come not unto him with a double heart.
29 Be not an hypocrite in the sight of men, and take good heed what thou speakest.
30 Exalt not thyself, lest thou fall, and bring dishonour upon thy soul, and so God discover thy secrets, and cast thee down in the midst of the congregation, because thou camest not in truth to the fear of the Lord, but thy heart is full of deceit.

The Brenton translation of the Septuagint is in the public domain.