From Egyptian Secrets of Albertus Magnus, Joseph H. Peterson edition:
To Sharpen Scythes for Mowing.
R. kitr., arvitr., romain erad, vitr., alb.,  r erad, of each for five cents, all pulverized, and some of it always kept nights in a dish put upon the grindstone, and sharpen therewith the scythe, and it will be in good condition for mowing.
The grimoire Egyptian Secrets of Albertus Magnus lists this spell.
Timeline of related events
1725Publication of Egyptian Secrets of Albertus Magnus (lists this spell)
1869English-language translation of Egyptian Secrets (lists this spell)