Twice Abraham moves to save Sodom.
In Genesis 14, the Mesopotamian army has plundered the city of Sodom and enslaved its people. We read, “The four kings [of Mesopotamia] seized all the goods of Sodom . . . and all their food; then they went away. They also carried off Abram’s nephew Lot and his possessions, since he was living in Sodom. A man who had escaped came and reported this to Abram the Hebrew” (Genesis 14:11-13). Upon hearing this, Abraham moves to save Sodom in that he pursues the army, defeats the army, and returns with all of the people and possessions of Sodom (v. 16). He restores everything back to the King of Sodom, not even keeping a sandal strap for himself. Thus, the city of Sodom is saved, and Sodom lives on to see another day.
In Genesis 18, the sins of Sodom have become so grievous that God “goes down to see if what they have done is as bad as the outcry that has reached [Him]” (v. 20-21). Abraham again steps forward to save Sodom. He approaches God, saying, “Will you sweep away the righteous with the wicked? . . . Far be it from you to do such a thing—to kill the righteous with the wicked, treating the righteous and the wicked alike. Far be it from you! Will not the Judge of all the earth do right?” Abraham bargains with God, asking Him to spare Sodom if just 50 righteous citizens can be found...then just 40...then just 30...then just 20...then, finally, just 10. God agrees to the terms, and Abraham returns home. At this point, it looks as if Abraham has done it again; it looks as if he has saved the city of Sodom once more. However, not even 10 good people are found in the entire city! Consequently, the people and possessions of Sodom are destroyed by fire and brimstone. This time, the city of Sodom is not saved. Sodom does not live on to see another day.
Note this interesting parallel:
Abraham hears the outcry of a survivor, who reaches him and tells him how dire the situation is. In a surprise attack at night, Abraham strikes at the Mesopotamians who have enslaved the people of Sodom.
God hears the outcry of the sinfulness of Sodom, which reaches Him and tells Him how dire the situation is. In a surprise attack, God strikes at the sins which have enslaved the people of Sodom.
In both cases, Abraham does whatever he can to save Sodom (as I mentioned before). How is it, though, that Abraham manages to save Sodom the first time but fails to do so the second time?
I think there are some key differences:
Abraham could rescue Sodom from the Mesopotamians.
Abraham could NOT rescue Sodom from itself.
Abraham could rescue Sodom from the injustice of their demise.
Abraham could not rescue Sodom from the justice of their demise.