2 Samuel 11:2-5

One day, late in the afternoon, David got up from his nap and went to the palace roof. As he walked about up there, he saw a woman having a bath. She was very beautiful. So he sent a messenger to find out who she was, and learnt that she was Bathsheba, the daughter of Eliam and the wife of Uriah the Hittite. David sent messengers to fetch her; they brought her to him and he made love to her. (She had just finished her monthly ritual of purification.) Then she went back home. Afterwards she discovered that she was pregnant and sent a message to David to tell him.