The Bible teaches that Israel will be under siege by the nations, but in that moment, they will turn to God and confess their sin, looking back on the one they pierced, Jesus Christ. This confession is rooted in Isaiah 53, where the prophet describes the suffering and glory of the Messiah. The Jewish people have been exposed to the gospel, but they have rejected it, seeking to establish their own righteousness and not needing a sacrifice. God's sovereignty is also a factor in their unbelief, as He shuts down their opportunity to believe. The view of Isaiah 53 provides a historical reason for their unbelief, as they were unimpressed with Jesus' life, death, and resurrection.
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