'Seed' in the Bible

(As he spake unto our fathers) Toward Abraham and his seed for ever.

The sower went forth to sow his seed: and as he sowed, some fell by the way side; and it was trodden under foot, and the birds of the heaven devoured it.

Now the parable is this: The seed is the word of God.

It is like unto a grain of mustard seed, which a man took, and cast into his own garden; and it grew, and became a tree; and the birds of the heaven lodged in the branches thereof.

And the Lord said, If ye had faith as a grain of mustard seed, ye would say unto this sycamine tree, Be thou rooted up, and be thou planted in the sea; and it would obey you.

and they asked him, saying, Teacher, Moses wrote unto us, that if a man's brother die, having a wife, and he be childless, his brother should take the wife, and raise up seed unto his brother.