2 Samuel 11:1-4

1And it came to pass, at the return of the year, at the time when kings go forth, that David sent Joab, and his servants with him, and all Israel; and they laid waste the [land of the] children of Ammon, and besieged Rabbah. But David abode at Jerusalem.

2And it came to pass at evening time that David arose from off his couch, and walked upon the roof of the king's house; and from the roof he saw a woman bathing, and the woman was very beautiful;

3and David sent and inquired after the woman. And one said, Is not this Bathsheba, the daughter of Eliam, the wife of Urijah the Hittite?

4And David sent messengers, and took her; and she came in to him, and he lay with her; and she had purified herself from her uncleanness; and she returned to her house.