Adam Clarke on Genesis 20:8

Abimelech rose early, etc. - God came to Abimelech in a dream by night, and we find as the day broke he arose, assembled his servants, (what we would call his courtiers), and communicated to them what he had received from God. They were all struck with astonishment, and discerned the hand of God in this business. Abraham is then called, and in a most respectful and pious manner the king expostulates with him for bringing him and his people under the Divine displeasure, by withholding from him the information that Sarah was his wife; when, by taking her, he sought only an honorable alliance with his family.