But how?

But did this salvation come by obeying rules? To ask the question is to miss the point. Salvation in the Old Testament meant love for Yahweh alone. One had to believe that Yahweh was the God of all gods, trusting that this Most High God had chosen covenant relationship with Israel to the detriment of all other nations. The law was how one demonstrated that love—that loyalty.—Michael Heiser, The Unseen Realm, 169 (emphasis original)