This is a poem by Lu Dongbin written during the Tang Dynasty, Lu Dong is best known as one of the 8 drunken immortals and is known for his poetry concerning tea, and tea ceremony.
One bowl moistens the lips and throat;
Two bowls shatters loneliness and melancholy;
Three bowls, thinking hard, one produces five thousand volumes;
Four bowls, lightly sweating, the iniquities of a lifetime disperse towards the pores.
Five bowls cleanses muscles and tendons;
Six bowls accesses the realm of spirit;
One cannot finish the seventh bowl, but feels only a light breeze spring up under the arms.