四分律比丘含注戒本 2.45

2.45

The Buddha was in the city of Aṭavī. The group of six bhikṣus recited sūtras together with various householders in a lecture hall; their voices were loud and disturbed those who were meditating. Bhikṣus brought up the fault and reported it to the Buddha, who on this account formulated this precept.