'Seed' in the Bible

They brought the head of Ishbosheth to David to Hebron, and said to the king, "Behold, the head of Ishbosheth, the son of Saul, your enemy, who sought your life! Yahweh has avenged my lord the king this day of Saul, and of his seed."

When your days are fulfilled, and you shall sleep with your fathers, I will set up your seed after you, who shall proceed out of your bowels, and I will establish his kingdom.

He gives great deliverance to his king, and shows loving kindness to his anointed, to David and to his seed, forevermore."