Yet the number of the children of Israel shall be as the sand of the sea, which cannot be measured nor numbered; and it shall come to pass, that in the place where it was said unto them, Ye are not my people, there it shall be said unto them, Ye are the sons of the living God.
Yet the number of the children of Israel shall be as the sand of the sea, which cannot be ... numbered.
Literally fulfilled in part at the return from Babylon, in which many Israelites joined with Judah. Spiritually, the believing seed of Jacob or Israel, Gentiles as well as Jews, shall be numerous "as the sand" (Genesis 32:12, "I will make thy seed (Jacob's) as the sand of the sea").
And it shall come to pass, that in the place where it was said unto them, Ye are not my people, there it shall be said unto them, Ye are the sons of the living God - the Gentiles, once not God's people, becoming His "sons" by adoption and grace through faith (John 1:12; Galatians 3:26; Romans 9:25-26, "As he saith also in Osee, I will call them my people, which were not my people; and her beloved, which was not beloved (Paul's rendering of Lo-ruhamah). And it shall come to pass, that in the place where it was said unto them Ye are not my people; there shall they be called the children of the living God; 1 Peter 2:10, "Which in time past were not a people, but are now the people of God: which had not obtained mercy (Peter's rendering of Lo-ruhamah), but now have obtained mercy. Both love and mercy are included in the Hebrew, Ruhamah; 1 John 3:1). To be fulfilled in its literal fullness hereafter in Israel's restoration (Romans 11:26, "All Israel shall be saved").
The living God - opposed to their dead idols.