Genesis 18:18, commentary and pictures

God honors Abraham by taking him into counsel and revealing His purposes to him. In that setting He tells Abraham of the coming judgment on Sodom, yet first makes clear that He examines the case and will still allow time for repentance if the people have not passed beyond mercy. The disclosure of Sodom's coming destruction is tied to Abraham's responsibility to train his household properly, and Abraham pleads for the honest inhabitants of the city before Sodom is destroyed.

Through the promised child Isaac and his descendants Abraham would become a great and mighty nation, and blessing for every nation on earth would come through him. That greatness was not for Israel's own advantage but so that God's name would be made known and be a blessing to the nations. The promise is linked to Abraham's faithfulness in teaching his household to follow the Lord's way and practice justice and judgment.

The blessing to all nations is fulfilled as God's people live in obedience that shows the Creator's goodness, mercy, justice, and love, with the fruit appearing in the union of Jews and Gentiles, and outward advantages or disadvantages do not determine who receives the covenant's spiritual blessings. Through Abraham's faithfulness, integrity, unselfishness, courage, and kindness he was a light to the people among whom he lived, so that through him God was revealed in Mesopotamia, Canaan, Egypt, and even Sodom. Together with the surrounding account, the verse carries a call to seek the Lord most earnestly and take a more decided stand for Him, to be not only professed believers in the truth but obedient to all of God's requirements, with confession of sin and earnest prayer with softened and subdued hearts.