Both phrases mean basically the same thing. This refers to a person cutting out smaller stones from a large rock to use for building. God compares this to Abraham and Sarah through whom he made the nation of Israel. AT: "Think about your ancestors who are like the rock from which I chiseled you and made you a nation." (See: [[rc://en/ta/man/translate/figs-parallelism]] and [[rc://en/ta/man/translate/figs-metaphor]] and [[rc://en/ta/man/translate/figs-activepassive]])