C. F. Keil and Franz Delitzsch on 2 Samuel 11:9

2Sa 11:9

But Uriah had his suspicions aroused. The connection between his wife and David may not have remained altogether a secret, so that it may have reached his ears as soon as he arrived in Jerusalem. “He lay down to sleep before the king’s house with all the servants of his lord (i.e., the retainers of the court),and went not down to his house.” “Before, or at, the door of the king’s house,” i.e., in the court of the palace, or in a building adjoining the king’s palace, where the court servants lived.