1684, Thomas Browne, “Observations upon Several Plants Mention’d in Scripture” in Certain Miscellany Tracts, London: Charles Mearne, pp. 28-29, For the Parable may not […] imply any or every grain of Mustard, but point at such a grain as from its fertile spirit, and other concurrent advantages, hath the success to become arboreous, shoot into such a magnitude, and acquire the like tallness.
Source: wiktionary