Sh'mu'el Bet (2 Sa) 11:2-5

Once, after his afternoon nap, David got up from his bed and went strolling on the roof of the king’s palace. From the roof he saw a woman bathing, who was very beautiful. David made inquiries about the woman and was told that she was Bat-Sheva the daughter of Eli‘am, the wife of Uriyah the Hitti. David sent messengers to get her, and she came to him, and he went to bed with her (for she had been purified from her uncleanness). Then she returned to her house. The woman conceived; and she sent a message to David, “I am pregnant.”