2 Samuel 20:3

Christian Standard Bible Anglicised

When David came to his palace in Jerusalem, he took the ten concubines he had left to take care of the palace and placed them under guard.  He provided for them, but he was not intimate with them. They were confined until the day of their death, living as widows.

Cross References

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.

Genesis 40:3

and put them in custody in the house of the captain of the guards  in the prison where Joseph was confined.

2 Samuel 20:2

So all the men of Israel deserted David and followed Sheba son of Bichri, but the men of Judah from the Jordan all the way to Jerusalem remained loyal to their king.