Proverbs 20:17 in the King James Version
Bread of deceit is sweet to a man; but afterwards his mouth shall be filled with gravel.
Context
16 Take the garment of one who puts up collateral for a stranger; and hold him in pledge for a wayward woman.
17 Fraudulent food is sweet to a man, but afterwards his mouth is filled with gravel.
18 Plans are established by advice; by wise guidance you wage war!