Final answer:
David committed adultery with Bathsheba, which led to consequences including the death of their child as described in the Bible.
Step-by-step explanation:
David committed adultery with Bathsheba, the wife of Uriah the Hittite. This event is recorded in the biblical narrative found in 2 Samuel 11:14-27. In an attempt to conceal the sin after discovering Bathsheba was pregnant, David sent for Uriah from the battlefront, hoping he would lie with his wife and believe the child to be his. When Uriah did not go to his wife, David then arranged for Uriah to be placed on the front lines of the battle where he was killed. After Uriah's death, David married Bathsheba, but their actions displeased the Lord, which led to consequences for David, described in 2 Samuel 12:1, 19, including the death of their child.