17 But the Lord afflicted Pharaoh and his house with great plagues because of Sarai, Abram's wife. 18 So Pharaoh called Abram and said, “What is this you have done to me? Why did you not tell me that she was your wife? 19 Why did you say, ‘She is my sister,’ so that I took her for my wife? Now then, here is your wife; take her, and go.”
Abraham was an imperfect man who required grace if he was going to be saved. As great as he was, his need for grace was no less than ours.