What does the Bible say about the security of believers?

In John 10:27-30, Jesus emphasizes the security of His sheep, stating that they hear His voice, He knows them, and they follow Him. He provides them with eternal life and declares that they shall never perish, as no one can snatch them from His hand. This assurance is rooted in the character of God and the security found in Christ, which is not dependent on human actions but on divine grace. The believer's security is anchored in Christ's power and the love of the Father, who is greater than all.