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]
(..) ...known as the IRS. And as we speak, at this very moment... ...he is handing over to her all of my pertinent tax information... ...and she has assured us... ...that the matter is well within her field of expertise. Why is she doing this? I don't know. It must be love. I don't think we should see (..)1991 TvShow: Seinfeld Title: The Truth Season: 3 Episode 2