never fear
Don't worry that a thing will or won't occur, be confident, as in I'll get there, never fear. This phrase was used by Christopher Marlowe in Doctor Faustus (c. 1590): “'Tis but a surfeit; never fear, man.”
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Example sentences from the Web for never fear
"Never-fear, we will do it," he answered confidently, and that seemed to settle it.
My Strangest Case |Guy Boothby