What does the Bible say about salvation through one person?

The concept of salvation wrought by one is profound in scripture, illustrated vividly in Genesis with the figure of Noah. God called Noah alone to build the ark and to enter it for salvation from the flood, highlighting that it was through Noah's obedience and work that his family was saved. This serves as a type that points to Christ, who accomplished salvation alone. Just as Noah acted faithfully, Christ alone is our Savior, completing all the necessary work for our redemption without any assistance from humanity. He bore our sins, reconciled us to God, and secured our salvation entirely by Himself.