Genesis 20:15Meaning & Commentary from the Church Fathers

He not only bestowed abundant blessings upon the virtuous individual but also granted him the freedom to reside on his estate: “Behold,” he declared, “my land is before you; dwell wherever you desire.” As the king recognized that his own life was granted for the sake of the righteous man and through his supplications, he began to minister to the stranger, the wanderer, and the previously unknown individual as his benefactor and protector.

Abimelech responded differently than Pharaoh, who, after initially agreeing, later rejected Moses, disregarded God's command, and failed to show obedience. In contrast, the king promptly summoned Abraham, restored his wife to him, took responsibility for his actions, and compensated for the dishonor of having encountered another man’s spouse.

Look, my land is available to you. In this situation, Abimelech does not behave like Pharaoh. While Pharaoh fears the righteous person and distances himself from them, Abimelech seeks to establish a relationship and harmony with him.