On Inferring That the Redeemer Will Spring from the Race of Shem

We read in the book *Complete Bible History: From the Creation of the World Down to the Death of the Apostles*, page 16: > When Noe awoke, and heard what had taken place, he cursed Ham in the person of his son Chanaan who, it is thought, had shared in his father's sin, declaring that he should be the servant of servants to his brethren.... > But Sem and Japheth he blessed. Filled with the spirit of God, he [Noe] announced that from the race of Sem should spring the Redeemer, saying "Blessed be the Lord God of Sem, be Chanaan his servant." > To Japheth he said, ``May God enlarge Japheth and may he dwell in the tents of Sem.'' This meant that the children of Japheth were to be blessed in listening to the heavenly doctrine which was to come into the world through the family of Sem. The above paragraphs are found here: https://ia800200.us.archive.org/16/items/CompleteBibleHistory1891/CompleteBibleHistory1891.pdf QUESTION: Can anyone explain how from the above paragraphs it may be inferred that the promised Redeemer should "spring" from the race of Shem? Thank you.