Bitter as Wormwood

Proverbs 5:1-6 (ESV)

Warning Against Adultery

5:1 My son, be attentive to my wisdom;
    incline your ear to my understanding,
that you may keep discretion,
    and your lips may guard knowledge.
For the lips of a forbidden woman drip honey,
    and her speech is smoother than oil,
but in the end she is bitter as wormwood,
    sharp as a two-edged sword.
Her feet go down to death;
    her steps follow the path to Sheol;
she does not ponder the path of life;
    her ways wander, and she does not know it.