2 Samuel 17:18-19

17:18 But a young man saw them on one occasion and informed Absalom. So the two of them quickly departed and went to the house of a man in Bahurim. There was a well in his courtyard, and they got down in it. 17:19 His wife then took the covering and spread it over the top of the well and scattered some grain over it. No one was aware of what she had done.