Tea drinking became such an integral part of the Chinese culture that it began to appear in art and literature. One famous poem by Lu Yu appeared in his 8th-century CE treatise on the forms and conventions which should be applied when drinking tea. The poem is a thank you note after Yu had received a gift of a packet of freshly picked tea.
To honour the tea, I shut my brushwood gate,
Lest common folk intrude,
And donned my gauze cap
To brew and taste it on my own.
The first bowl sleekly moistened throat and lips;
The second banished all my loneliness;
The third expelled the dullness from my mind,
Sharpening inspiration gained from all the books I’ve read.
The fourth brought forth light perspiration,
Dispersing a lifetime’s troubles through my pores.
The fifth bowl cleansed ev’ry atom of my being.
The sixth has made me kin to the Immortals.
The seventh is the utmost I can drink -
A light breeze issues from my armpits.
(in Ebrey, 95)
https://www.ancient.eu/article/1093/tea-in-ancient-china--japan/
