We see Abram and his allies helped by God to defeat the forces that had plundered Sodom and a number of other cities and rescue his nephew, Lot. Then Melchizedek comes with bread and wine, blesses Abram and receives a tithe from him.
We see in these events how gracious our God is, in that they confirm the covenants God had already made with him. We see images of the Christ, the seed of Abram, in his defeat of the kings and in the person of Melchizedek. We are encouraged to consider that God has also gone to extraordinary lengths to confirm His promises to His children - He has added to the promise with an oath sworn by Himself and granted us the Spirit who testifies with our spirits that we are His children. How grateful we should be! And if we are not His children, this should encourage us to come to such a God, confess and repent of our sins and believe on Christ as our Savior.