2 Samuel 16:20-17:4

ASV(i) 20 Then said Absalom to Ahithophel, Give your counsel what we shall do. 21 And Ahithophel said unto Absalom, Go in unto thy father's concubines, that he hath left to keep the house; and all Israel will hear that thou art abhorred of thy father: then will the hands of all that are with thee be strong. 22 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. 23 And the counsel of Ahithophel, which he gave in those days, was as if a man inquired at the oracle of God: so was all the counsel of Ahithophel both with David and with Absalom.
17 1 Moreover Ahithophel said unto Absalom, Let me now choose out twelve thousand men, and I will arise and pursue after David this night: 2 and I will come upon him while he is weary and weak-handed, and will make him afraid; and all the people that are with him shall flee; and I will smite the king only; 3 and I will bring back all the people unto thee: the man whom thou seekest is as if all returned: [so] all the people shall be in peace. 4 And the saying pleased Absalom well, and all the elders of Israel.