Deuteronomy 29:20

20 the Lord will be unwilling to pardon them, for the Lord's anger and passion will smoke against them. All the curses written in this book will descend on them, and the Lord will blot out their names from under heaven.

Deuteronomy 29:20 In-Context

18 It may be that there is among you a man or woman, or a family or tribe, whose heart is already turning away from the Lord our God to serve the gods of those nations. It may be that there is among you a root sprouting poisonous and bitter growth.
19 All who hear the words of this oath and bless themselves, thinking in their hearts, "We are safe even though we go our own stubborn ways" (thus bringing disaster on moist and dry alike) —
20 the Lord will be unwilling to pardon them, for the Lord's anger and passion will smoke against them. All the curses written in this book will descend on them, and the Lord will blot out their names from under heaven.
21 The Lord will single them out from all the tribes of Israel for calamity, in accordance with all the curses of the covenant written in this book of the law.
22 The next generation, your children who rise up after you, as well as the foreigner who comes from a distant country, will see the devastation of that land and the afflictions with which the Lord has afflicted it—
New Revised Standard Version Bible, copyright 1989, Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.