Isaiah 59:21

“As for Me, this is My covenant with them,” says the LORD: “My Spirit which is upon you [writing the law of God on the heart], and My words which I have put in your mouth shall not depart from your mouth, nor from the mouths of your [true, spiritual] children, nor from the mouth of your children’s children,” says the LORD, “from now and forever.” [Jer 31:33; Rom 11:26, 27; Gal 3:29; Heb 12:22-24]