The “house of Jacob” refers to the descendants of this great patriarch who had gained the covenant name of Israel through personal righteousness. However, both the northern and southern kingdoms of Israel fell, though at different times, because they replaced God with apostate worship. They were “replenished from the east” (2 Nephi 12:6) or, according to Isaiah 2:6 footnote a, they were “filled, supplied with teachings, alien beliefs” of false gods, “like the Philistines.” In other words, they forsook the gospel of the Lord for teachings and priorities from the world. Their hearts were set on riches and wickedness, and their worship turned to idols.