What does the Bible say about God's preservation of believers?

In Amos 9:9, we see God promising to sift His people among the nations, yet assures us that 'not the least grain shall fall upon the earth.' This illustrates the divine truth that while believers may face trials and challenges, God’s sovereignty ensures that they will ultimately be preserved. The sifting process may come from various sources, including the devil, the world, and even apostate elements within the church, yet God's commitment to His people is unwavering. It highlights that the true believers will endure through their trials, ultimately being safeguarded by God's grace and mercy, affirming that no genuine believer will face loss that cannot be redeemed or transformed into greater spiritual gain.