His boss 'assured' him that he had her continued support. = His boss 'assured' him of her continued support. = “You have my continued support,” his boss 'assured' him.
You can 'rest assured' [=you can be sure] that these mistakes won't happen again. = 'Rest assured', these mistakes won't happen again.
They are not 'assured of' being paid. [=it is not certain that they will be paid]
(..) and you'll find in a month, I don't care about the scar. Is it, uh...is it why we opened you up? Rest assured, we didn't harvest your organ or anything and we merely slipped a little package in your lower stomach. It's a...it's a new drug the kids in Europe is gonna love, believe me. - What's that? (..)2014 Lucy