The commentators state that God proclaimed, "I appeared to Abraham, to Isaac, and to Jacob, being their God," while Aquila expresses it as, "I was seen by Abraham, Isaac, and Jacob in the strong God." This indicates that it was not the Supreme Being, the Only God who exists, that revealed Himself in the same manner as He did to Moses and the patriarchs, in the guise of an angel, a burning bush, or fire. Instead, it was "in the strong God," illustrating that through the Son, the patriarchs were also able to behold the Father, as affirmed in the Gospels: "He who has seen Me has seen the Father" (John 14:9). It is in Him and through Him that the knowledge of the Father was made manifest.
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This occurred when the Savior of humanity came into appearance in human form, offering the faithful a promise of His forthcoming salvation for all, stemming from Him (cf. 2 Cor. 1:22; 5:5; Eph. 1:14). When it was time to punish the wicked and afflict the Egyptians, He did not initially reveal Himself "in the form of a strong God," but rather in the guise of an angel, acting as an agent of wrath, and in the form of flames, which had not yet consumed them due to the wildness of the thorny thickets. The thorn bush symbolizes the harsh, merciless burden of the Egyptians, whereas the fire represents the punitive force that descended upon them.