When David returned to his palace in Jerusalem, he took the ten concubines he had left to care for the palace, and he placed them in a house under guard. He provided for them, but he no longer slept with them. They were confined until the day of their death, living as widows.

2 Samuel 15:16
Then the king set out, and his entire household followed him. But he left behind ten concubines to take care of the palace.

2 Samuel 16:21
Ahithophel replied, "Sleep with your father's concubines, whom he has left to keep 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."

2 Samuel 16:22
So they pitched a tent for Absalom on the roof, and he slept with his father's concubines in the sight of all Israel.

2 Samuel 20:2
So all the men of Israel deserted David to follow Sheba son of Bichri. But the men of Judah stayed by their king all the way from the Jordan to Jerusalem.

And David came to his house at Jerusalem; and the king took the ten women his concubines, whom he had left to keep the house, and put them in ward, and fed them, but went not in to them. So they were shut up to the day of their death, living in widowhood.