Romans 9:29

And as Isaiah said before: "Unless the LORD of Sabaoth had left us a seed, We would have become like Sodom, And we would have been made like Gomorrah."

Surrounding context

9:28 For He will finish the work and cut it short in righteousness, Because the LORD will make a short work upon the earth."

9:29 And as Isaiah said before: "Unless the LORD of Sabaoth had left us a seed, We would have become like Sodom, And we would have been made like Gomorrah."

9:30 What shall we say then? That Gentiles, who did not pursue righteousness, have attained to righteousness, even the righteousness of faith;

Translation and sources