Charles Spurgeon Commentary Romans 9:27-29

"And Isaiah crieth concerning Israel, If the number of the children of Israel be as the sand of the sea, it is the remnant that shall be saved: for the Lord will execute [his] word upon the earth, finishing it and cutting it short. And, as Isaiah hath said before, Except the Lord of Sabaoth had left us a seed, We had become as Sodom, and had been made like unto Gomorrah." — Romans 9:27-29 (ASV)

Esaias also crieth concerning Israel, Though the number of the children of Israel be as the sand of the sea, a remnant shall be saved: For he will finish the work, and cut it short in righteousness: because a short work will the Lord make upon the earth. And as Esaias said before, Except the Lord of Sabaoth had left us a seed, we had been as Sodoma, and been made like unto Gomorrha.

God has a people, then, even in Israel with all its rejection; and he will always have, for he will never make the seed of Abraham to be as Sodom and Gomorrah. He will love his own, and glorify himself in the midst of his people.