The Flower Sermon is a story of the origin of Chan and Zen Buddhism in which Gautama Buddha transmits direct prajñà(wisdom) to the disciple MahÃÂkÃÂà Âyapa. In the original Chinese, the story is NiÃÂn huàwéi xiào (æÂÂè±微ç¬Â, meaning "Picking up a flower and smiling"). It appears as Case 6 in the Zen koan collection, The Gateless Barrier (WúménguÃÂn; Jap. Mumonkan).
In the story, the Buddha gives a wordless sermon to his disciples (sangha) by holding up a white flower. No one in the audience understands the Flower Sermon except MahÃÂkÃÂÃ Âyapa, who smiles. Within Zen, the Flower Sermon communicates the ineffable nature of tathÃÂtÃÂ (suchness) and MahÃÂkÃÂÃ Âyapa's smile signifies the direct transmission of wisdom without words. The Buddha affirmed this by saying:
The story of the Flower Sermon appears to have been recorded by Chinese Chan Buddhists. The earliest known version of the tale appeared in 1036.