From Egyptian Secrets of Albertus Magnus, Joseph H. Peterson edition:
If a Horse is Injured by Pressure, Swellings or Tumors which have to be Cut.
After cutting the horse, approach to the front of the horse, tear some few hairs out under its mane, and pronounce: In the name of the Father, the Son and the Holy Spirit; then walk around the horse and take also a few hairs from under the throat and speak as before. Walk again around the horse and take some hair from the tail and pronounce the same blessing, then walk again around the horse' and stand still just as you received the horse. Pray the Lord's Prayer three times, three Ave Marias and the Creed once. Now, take the hair altogether, bore a hole into a pear-tree, put the hair therein, or draw the bark, and put the hair between. Probatum!
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)