'Offspring' in the Bible

Then the angel replied to her, “The Holy Spirit will come upon you, and the power of the Most High will overshadow you [like a cloud]; for that reason the holy (pure, sinless) Child shall be called the Son of God.

So he began saying to the crowds who were coming out to be baptized by him, “You brood of vipers, who warned you to flee from the wrath [of God that is] to come?

and they questioned Him, saying, “Teacher, Moses wrote for us [a law that] if a man’s brother dies, leaving a wife and no children, his brother should marry the wife and raise children for his brother.