Euebius of Caesarea: Believers Substituted for Israel

Do not suppose that the "house of Jacob" is only the Jewish people; no, it is all those, from the nations, who through the Saviour's call are included in the adoption of the saints. God's people is sometimes called "Jacob" and sometimes "Israel", because Israel and Jacob were the same person. In nature, Jacob was the ancient people, as being descended from him through blood-relationship; but by adoption, it is the new people, by a relationship of virtue. The new people has been substituted for the old; in future, therefore, he will be king over this people "to eternity" (in other words, for ever), and it will acknowledge him by its actions and its words, voluntarily submitting itself to his authority. Eusebius of Caesarea (c. 263 - 339), Gospel Problems and Solutions, Ed. Roger Pearse, pp. 165 & 167, Chieftan Publishing (Ipswich, 2010), David J.D. Miller, section translator.