Genesis 14:22 And Abram said to the king of Sodom, I have lift up mine hand unto the LORD, the most high God, the possessor of heaven and earth,
Abram has won a victory of great proportions. He is rich with all that has been taken. The king of Sodom tells Abram to just take all that he recovered for himself. Abram says that he gave his word to God that he would not do that.
Sometimes when we need things from God we are quick to make promises that we will do something or stop doing something else. Then when God answers our prayer we are quick to forget what we promised.
I love how Abram keeps his word and then in the next chapter you see God rewarding him for his faithfulness.