'Offspring's' in the Bible

And I will put hostility between you and the woman and between your offspring and her offspring; her offspring will attack your head, and you will attack her offspring's heel."

“As for Me, this is My covenant with them,” says the Lord: “My Spirit which is upon you, and My words which I have put in your mouth shall not depart from your mouth, nor from the mouth of your offspring, nor from the mouth of your offspring’s offspring,” says the Lord, “from now and forever.”