Who was Christ made sin for?

According to 2 Corinthians 5:21 and the surrounding context, Christ was made sin for those who believe in Him and are thereby reconciled to God. These include all for whom He died, indicating a limited atonement focused on the elect. This truth assures believers that they are the recipients of His sacrifice, emphasizing that their sins are no longer counted against them. It is a reminder of the personal nature of salvation and the assurance that if they trust in Christ, they are made right with God, no longer under condemnation, but instead, embraced as part of His family.