四分律比丘含注戒本 1.358

1.358

(The Buddha was in Śrāvastī. A bhikṣu who had only three robes had a saṃghāṭī that was worn out, and within ten days he was unable to procure [material]. [The Buddha] permitted keeping extra robes in order to obtain a sufficient amount. The group of six bhikṣus took matching robes that were insufficient, washed, dyed, and marked them, and entrusted them to others while traveling. The bhikṣus brought up the fault, and the Buddha rebuked them and formulated the precept.)