Joseph would be a recipient of Christ’s finished work on the cross. Because he brought the baby home with him, nurtured him, protected him, cared for him and trained him. Despite the fact that Joseph was a righteous and sensitive man he still needed a Saviour and that Saviour was Jesus. Even the best of us need a Saviour. Humanly speaking Joseph was righteous. Spiritually speaking he needed a Saviour and that was the child that he had adopted as his own.
2 Timothy 3: 16-17
All Scripture is God-breathed and is useful for teaching, rebuking, correcting and training in righteousness, so that the servant of God may be thoroughly equipped for every good work.