1. Christ was cursed by God to save us. (Deut 21:22-23)
    Jn 19:30-31, Gal 3:13, 2 Cor 5:21

In the Old Testament, a person who died on a tree was cursed by God. (Deut 21:22-23)

Deut 21:22 And if a man have committed a sin worthy of death, and he be to be put to death, and thou hang him on a tree:
23 His body shall not remain all night upon the tree, but thou shalt in any wise bury him that day; (for he that is hanged is accursed of God;) that thy land be not defiled, which the Lord thy God giveth thee for an inheritance.

Jesus died on the cross under the curse of God in our place to save us. (John 19:30-31, Galatians 3:13, 2 Corinthians 5:21)

John 19:30 When Jesus therefore had received the vinegar, he said, It is finished: and he bowed his head, and gave up the ghost.
31 The Jews therefore, because it was the preparation, that the bodies should not remain upon the cross on the sabbath day, (for that sabbath day was an high day,) besought Pilate that their legs might be broken, and that they might be taken away.

Galatians 3:13 Christ hath redeemed us from the curse of the law, being made a curse for us: for it is written, Cursed is every one that hangeth on a tree:

2 Corinthians 5:21 For he hath made him to be sin for us, who knew no sin; that we might be made the righteousness of God in him.