21 The LORD will plague you with diseases until he has destroyed you from the land you are entering to possess.

Read Deuteronomy 28:21 Using Other Translations

The LORD shall make the pestilence cleave unto thee, until he have consumed thee from off the land, whither thou goest to possess it.
The LORD will make the pestilence stick to you until he has consumed you off the land that you are entering to take possession of it.
The LORD will afflict you with diseases until none of you are left in the land you are about to enter and occupy.