John 12:3 tells us, "Then Mary took about a pint of pure nard, an expensive perfume; she poured it on Jesus' feet and wiped his feet with her hair. And the house was filled with the fragrance of the perfume." (Holy Bible, New International Version)
Mary's act of devotion to our Lord was expensive and unusual. Not only was perfume typically poured upon someone's head, Mary used her hair to wipe Jesus' feet ? and a reputable woman in those days did not unbind her hair in public.
What can we learn from this act of devotion? Mary had been a prostitute. She possibly had heard Jesus' message and changed her life because of it. Out of gratitude to Christ, she humbled herself and washed his feet with her tears. She unashamedly performed this act, kissing his feet in appreciation.