2 Samuel 16:21-22

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. So they spread Absalom a tent upon the top of the house; and Absalom went in unto his father's concubines in the sight of all Israel.