How do we know that God will be merciful to His elect?

Isaiah emphasizes that God will show mercy to His elect, a promise underscored by His unwavering commitment to His character. In Isaiah 1:25-26, it is written that God will turn His hand upon His chosen people to redeem them through justice and righteousness. This reflects His covenant faithfulness, as God has promised to save His chosen ones despite their transgressions. The assurance that God will redeem His elect is rooted in His definitive act of grace, demonstrated through Christ's atoning work, which fully satisfies divine justice while granting mercy to those who believe.