The girl was unsurpassed in beauty; she cared for the king and served him, but he had no relations with her.

1 Kings 1:3
Then they searched throughout Israel for a beautiful girl, and they found Abishag the Shunammite and brought her to the king.

1 Kings 1:5
At that time Adonijah, David's son by Haggith, began to exalt himself, saying, "I will be king!" And he acquired chariots and horsemen and fifty men to run ahead of him.

1 Kings 2:17
Adonijah replied, "Please speak to King Solomon, since he will not turn you down. Let him give me Abishag the Shunammite as my wife."

1 Kings 2:21
So Bathsheba said, "Let Abishag the Shunammite be given to your brother Adonijah as his wife."

And the damsel was very fair, and cherished the king, and ministered to him: but the king knew her not.