Genesis 15:18Meaning & Commentary from the Church Fathers

When all was completed and the flames had consumed the sacrificial portions of the animals, the Lord established a covenant with Abraham, declaring, "I give unto thy seed this land, from the river of Egypt unto the great river, the river Euphrates: the Kenites, the Kenites, the Kedmonites, the Hittites, the Perizzites, the Rephaim, the Amorites, the Canaanites, the Gergesites, and the Jebusites." Observe how the Lord reaffirms His promise. He 'made' a covenant, proclaiming, "To thy offspring I give this land." In this declaration, the righteous man is to understand the vastness of the earth and the extent of its boundaries, illustrating how extensively his descendants will flourish.

The phrase “by the form of fire” refers to the divine nature, consistent with Chaldean traditions regarding oaths. The Apostle Paul interprets this as emblematic of a solemn promise, noting that when God promised Abraham, He swore by Himself since there was no greater being to whom He could appeal, declaring, “Verily blessing I will bless thee, and multiplying I will multiply thee.” Thus, after patiently enduring, Abraham received the fulfillment of what was promised. Humans often swear by the highest authority, and a solemn oath resolves their disputes. In a similar manner, God, wishing to manifest the steadfastness of His purpose to the heirs of His promise, also employed an oath as assurance.

The promise made to Abraham clearly defines the territory of Canaan and identifies eleven nations, stretching from the river of Egypt to the mighty Euphrates. This boundary does not refer to the prominent Nile River, but rather to the lesser stream that separates Egypt from Palestine, adjacent to the city of Rinokorura.

The nations outside of Israel are entrusted to Him as a lesson, guiding even the most diligent and righteous individuals to shun sin and rectify mistakes. However, the structure of the Church is also clearly illustrated here; through her apostles—who are descendants of Israel and through whom Christ was born under the law according to the flesh (Rom. 9:4-5)—the Church will be formed from the Gentiles who are called to faith. It is significant that He referred to them with the total number of ten, symbolizing that those who were once unfaithful, after reaching the fullness of their iniquity, are now offered the reward of faith.

On this day the Lord fulfilled His promises. The narrator appears to reiterate the details of the previous account. From the Nile River to the great Euphrates, these were the territories ruled by David and Solomon (2 Samuel 8:3, 2 Chronicles 9:26). While these rivers did not strictly define the borders of the promised land, they serve as definitive markers for a prophecy that would span many centuries, clearly indicating the dwelling place of Abram's descendants.

After the torches had moved between the divided animals, the Lord affirmed His covenant by stating, "To your offspring I give this land," and He elaborated on the boundaries of that territory. This land, bestowed upon the spiritual descendants of the faithful, should be understood in light of the profound significance previously expressed. This promise is also extended by the Redeemer to those who embody humility. Such a promise is suitable only for genuine heirs, not for all who are born through physical lineage. Indeed, it is not the physical descendants who are recognized as children of God, but rather those who are considered children of the promise. For the one who performs the deeds of Abram is indeed his child.