Isaiah 10:22-23

God had promised Abraham that his descendants would be as numerous as the sand grains of the sea (Genesis 22:17; Genesis 32:12). This did not mean, as the Israelites in Isaiah’s day apparently concluded, that they would always be a large people. No, God would so thoroughly destroy them because of their sin that only a small number would survive (cf. Romans 9:27-28). The sovereign Yahweh of armies would destroy them throughout the whole Promised Land, not just in the Northern Kingdom.