2 Samuel 16:21

Ahithophel replied, “Sleep with your father’s concubines, whom he has left to take care of the palace. When all Israel hears that you have become a stench to your father, then the hands of all who are with you will be strengthened.”

And Ahithophel said unto Absalom, Go in unto thy father’s concubines, which he hath left to keep the house; and all Israel shall hear that thou art abhorred of thy father: then shall the hands of all that are with thee be strong.