Rabanus Maurus
Catena Aurea · Matthäusevangelium 26
Now when Jesus was in Bethany, in the house of Simon the leper, There came unto him a woman having an alabaster box of very precious ointment, and poured it on his head, as he sat at meat. But when his disciples saw it, they had indignation, saying, To what purpose is this waste? For this ointment might have been sold for much, and given to the poor. When Jesus understood it, he said unto them, Why trouble ye the woman? for she hath wrought a good work upon me. For ye have the poor always with you; but me ye have not always. For in that she hath poured this ointment on my body, she did it for my burial. Verily I say unto you, Wheresoever this Gospel shall be preached in the whole world, there shall also this, that this woman hath done, be told for a memorial of her.
From the Greek πίστις, faith, whence ‘pisticus,’ faithful. For this ointment was pure, unadulterated.