'Seed' in the Bible

(Now the promises were given to Abraham and to his seed. God did not say 'and to seeds,' as if speaking of many, but 'and to your seed,' since He spoke of only one--and this is Christ.)

Why then was the Law given? It was imposed later on for the sake of defining sin, until the seed should come to whom God had made the promise; and its details were laid down by a mediator with the help of angels.