How does Jesus ensure the salvation of His people?

Salvation is secured through Jesus Christ's work as both our High Priest and sacrificial Lamb. By offering Himself once for all on the cross, He attained a perfect righteousness that is credited to believers, ensuring their acceptance before God. Moreover, His advocacy for His people means that He intercedes on their behalf, asking the Father to protect and preserve them in faith. This divine security is a testament to God's grace, affirming that all whom the Father has given to Christ will ultimately come to faith and be saved.