Introduction:
Abimelech, a king of Gerar, is a notable figure in the biblical narrative, particularly in the context of his interactions with Abraham and Isaac. His account is primarily found in the Book of Genesis, where his integrity is highlighted in two significant episodes involving the patriarchs.

Abimelech and Abraham (Genesis 20):
The first encounter between Abimelech and Abraham occurs in Genesis 20. Abraham, fearing for his life due to the beauty of his wife Sarah, tells Abimelech that she is his sister. Abimelech, unaware of the truth, takes Sarah into his household. However, God intervenes by appearing to Abimelech in a dream, warning him of the truth and the potential consequences of his actions.

In Genesis 20:4-5 , Abimelech responds to God, "Lord, will You destroy a nation even though it is innocent? Did Abraham not tell me, ‘She is my sister,’ and did she not also say, ‘He is my brother’? I have done this with a clear conscience and clean hands." This plea underscores Abimelech's integrity, as he acted without malicious intent or knowledge of wrongdoing.

God acknowledges Abimelech's integrity in Genesis 20:6 , saying, "Yes, I know that you did this with a clear conscience, and so I have kept you from sinning against Me. That is why I did not let you touch her." Abimelech's integrity is further demonstrated by his immediate compliance with God's instructions to return Sarah to Abraham, along with compensatory gifts to demonstrate his sincerity and to rectify the situation.

Abimelech and Isaac (Genesis 26):
The second significant episode involving Abimelech occurs with Isaac, Abraham's son, in Genesis 26. Similar to his father, Isaac fears for his safety due to his wife Rebekah's beauty and claims she is his sister. Abimelech, observing Isaac's behavior with Rebekah, realizes the truth and confronts him.

In Genesis 26:9-10 , Abimelech says to Isaac, "Behold, she is your wife! How could you say, ‘She is my sister’?” Isaac replied, “Because I thought I might die on account of her.” Then Abimelech declared, “What is this you have done to us? One of the people might easily have slept with your wife, and you would have brought guilt upon us.” Abimelech's response reflects his concern for moral integrity and the well-being of his people.

Abimelech's integrity is further demonstrated by his actions following this revelation. He issues a public decree to protect Isaac and Rebekah, as recorded in Genesis 26:11 : "So Abimelech warned all the people, saying, ‘Whoever harms this man or his wife shall surely be put to death.’" This decree underscores his commitment to justice and the protection of those under his rule.

Conclusion:
Abimelech's interactions with both Abraham and Isaac highlight his integrity and moral character. Despite being misled, he responds with righteousness and a desire to maintain justice, demonstrating a clear conscience and a commitment to doing what is right in the eyes of God.