21 The LORD will single them out from all the tribes of Israel for disaster, according to all the curses of the covenant written in this Book of the Law.

Read Deuteronomy 29:21 Using Other Translations

And the LORD shall separate him unto evil out of all the tribes of Israel, according to all the curses of the covenant that are written in this book of the law:
And the LORD will single him 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.
The LORD will separate them from all the tribes of Israel, to pour out on them all the curses of the covenant recorded in this Book of Instruction.