What does the Bible say about Christ's suffering for sins?

1 Peter 3:18 emphasizes the centrality of Christ's suffering: 'For Christ also hath once suffered for sins, the just for the unjust, that he might bring us to God.' This verse encapsulates the idea of substitutionary atonement, where Christ, who is completely just, took on the sins of the unjust. He suffered in our place, fulfilling divine justice, ensuring that all who are in Him are accepted by God. His suffering was once and for all, meaning no further sacrifice is necessary for our salvation.