四分律比丘含注戒本 3.199

3.199

The Buddha was in Śrāvastī. A householder prepared food. The group of six received little, while the neighboring seats received much. They said to the householder: "Now that you invite the saṃgha, you arbitrarily give more or less. The householder has favoritism." He replied: "We gave [evenly]." The bhikṣus brought up the fault, and the Buddha consequently formulated the precept.