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rest assured

You can be sure, as in Rest assured that the police will recover your diamonds. This expression uses assured in the sense of “certain” or “confident,” a usage dating from the early 1500s.
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Examples from the Web for rest assured
Contemporary Examples
Historical Examples
  • Something terrible has happened to the child, you may rest assured.

    Tanglewood Tales Nathaniel Hawthorne
  • Monsieur and Madame may rest assured that everything has been done.

  • rest assured that Beckendorff is not a man to act incautiously or weakly.

    Vivian Grey Earl of Beaconsfield, Benjamin Disraeli
  • You may rest assured of each of the facts related in this letter.

    Patrick Henry

    Moses Coit Tyler
  • We will do all in our power to aid you, rest assured of that.

    The Crevice

    William John Burns and Isabel Ostrander

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