四分律比丘含注戒本 3.375

3.375

佛在舍衛。六群佛塔四邊涕唾，比丘舉過，佛因訶制。

The Buddha was in Śrāvastī. The group of six blew their noses and spat around the four sides of a Buddha stupa. The bhikṣus pointed out the fault, and the Buddha thereupon rebuked them and instituted [the precept].