Genesis 14-15

In Chapter 14, we see how Man's sinfulness continue to manifest itself since the Fall of Man and even after the Great Flood. People fight and sin against each other. (V 1-11). Lot and his family who lived in the war zone of Sodom got captured too (V12).

When Abram heard about it, will he forsake his nephew now? No, he will come and rescue him and his family and possessions! What a great heart! How bold and courageous was Abram now, in amazing contrast to his time in Egypt during the famine. How great faith he now demonstrates before all his family, relatives, servants, and the enemies! God honored him and gave him the victory in this rescue mission (V 13-16).

Abram will keep his integrity even after the victory. He would not compromise his character now. He tithed unto the priestly king Melchizedek (a figure of Christ Jesus) (V 17-20). He maintained his good testimony before the king of Sodom by manifesting his trust and gratitude towards the Lord God Himself, not to any human king (V 21-24).

In Chapter 15, God promised Abram a son and many descendants (V 1-7).
The Lord cut an unconditional covenant with Abram (V 8-21).
Even if Abram would be unfaithful or fail somehow on his side, God would still be faithful to this extraordinary covenant that would eventually bring about the virgin birth of the Messiah Jesus Christ centuries later.