John Gill Commentary Deuteronomy 29:27

"therefore the anger of Jehovah was kindled against this land, to bring upon it all the curse that is written in this book;" — Deuteronomy 29:27 (ASV)

And the anger of the Lord was kindled against this land
For this their idolatry and base ingratitude:

to bring upon it all the curses that are written in this book ;
in this book of Deuteronomy, and particularly (Deuteronomy 28:16–68) ; see (Daniel 9:11) .