Sirach 12:15-17

Revised Standard Version Catholic Edition

¹⁶ An enemy will speak sweetly with his lips,
    but in his mind he will plan to throw you into a pit;
an enemy will weep with his eyes,
    but if he finds an opportunity his thirst for blood will be insatiable.
¹⁷ If calamity befalls you, you will find him there ahead of you;
    and while pretending to help you, he will trip you by the heel;