Genesis 14:

Summary: Several kings attack the cities of Sodom and Gomorrah. The kings lay waste to the countryside, sack Sodom and Gomorrah, and take Lot captive. Abram pursues them to Damascus with an army of his servants, recovers their booty, and saves Lot. They return. Melchizedek, king of Salem, takes a tithe from Abram. He refuses any of the loot from the fight.

Personal Reflection: It seems like the kings that come against Sodom and Gomorrah are from various areas in Mesopotamia (Elam and Shinar are what gives this away. Where the other kings come from I think is unknown). They would have traveled up through Syria and then back down to the South of the Dead Sea (where it is thought Sodom and Gomorrah were located). That's why Abram would have pursued them up all the way to Damascus instead of straight toward Mesopotamia (the reason people didn't travel straight across is because it is all desert between).

Melchizedek is an enigmatic figure. He is the king of Salem which, we can assume, is the ancient Jerusalem. There isn't much information about him, but his name means "King of Righteousness" and he seems to be a kind of spiritual leader for Abram since he tithed Abram.