There are a few lines of evidence that are used by the Orthodox Jews and a number of Christians to defend the idea that the Abrahamic Covenant and the Land Covenant are both unconditional in nature. Firstly, all the commitments in regard to those covenants were made by God the Creator. Abraham, Isaac and Jacob did not have to meet any requirements. The manner wherein the covenants were confirmed explains this.
In the ancient Middle East a significant way to establish a covenant was as follows: animals would be cut in half,
and the halves would be arranged side by side with a path between. If all the parties of a covenant were making commitments,
all of them would pass between the halves of the animals. If only one party was making commitments, that party alone would pass between the halves.
(Source: Showers, Renald. A Study of Replacement Theology vs. God’s Faithfulness in the End-Times. pp. 67-68)
Since God alone passed the halves of the carcasses while Abraham was put to deep sleep, it was God who made all the commitments, while Abraham was not required to do so.Dr. Renald Showers explains:
Abraham made no commitments. God made them all.
Therefore, Abraham was not required to meet any conditions for the covenant to remain in effect and its promises to be fulfilled.
Since God made all the commitments, the covenant remaining in effect
and its promises being fulfilled depend exclusively on God being faithful to His Word.
(Source: Showers, Renald. A Study of Replacement Theology vs. God’s Faithfulness in the End-Times. p. 68)
Tragically, a great number of good Christians fail to recognize the uniqueness of the Abrahamic Covenant and the Land Covenant. As a result they steal these everlasting, unconditional promises from the physical descendants of Abraham, Isaac and Jacob and apply it to themselves. This is one of the results of confusing the origin, the purpose and the destiny of Israel and the Church, in other words of failing to rightly divide the word of truth.