2 Samuel 17:17-18

17Jonathan and Ahimaaz were staying at En-rogel, where a servant girl would come and pass along information to them. They in turn would go and inform King David, because they dared not be seen entering the city.

18However, a young man did see them and informed Absalom. So the two left quickly and came to the house of a man in Bahurim. He had a well in his courtyard, and they climbed down into it.