Crossword puzzle clue "they're done"

Source of the line "What's done is done"

"Done and done!"

"Done and done"

They're not done until they're burned

Give someone a book that they'll "give back to you when they're done reading," as I did with "The Wind-Up Bird Chronicle" over three years ago

They usually leave two when they're done

They're done

"They that have done this deed are honourable" speaker