Sirach 4:27

27 Make not thyself an underling to a foolish man; neither accept the person of the mighty.

Sirach 4:27 In-Context

25 In no wise speak against the truth; but be abashed of the error of thine ignorance.
26 Be not ashamed to confess thy sins; and force not the course of the river.
27 Make not thyself an underling to a foolish man; neither accept the person of the mighty.
28 Strive for the truth unto death, and the Lord shall fight for thee.
29 Be not hasty in thy tongue, and in thy deeds slack and remiss.

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