Genesis 20:8

8.Therefore Abimelech rose early in the morning. Moses teaches how efficacious the oracle had been. For Abimelech, alarmed at the voice of God, arose in the morning, not only that he himself might quickly obey the command enjoined upon him but that he might also exhort his own people to do the same. An example of such ready obedience is shown us in a heathen king, that we may no more make excuses for our torpor, when we are so little profited by the Divine remonstrances. God appeared to him in a dream; but since he daily cries aloud in our ears, by Moses, by the prophets and by the apostles, and finally, by his only-begotten Son, it were absurd to suppose that so many testimonies should avail less than the vision of a single dream.