四分律比丘含注戒本 1.124

1.124

佛遊舍衛城。迦留陀夷欲意熾盛，身色瘦悴，獨處一房，好床蓐被，地施敷具，飯食豐足，隨念弄失，諸根悅豫，顏色光澤。諸比丘舉過白佛，佛無數訶責已，而制此戒。

The Buddha was wandering in Śrāvastī. Kālodayin’s lustful intentions flared fiercely, and his physical appearance was emaciated. Dwelling alone in a room, with fine bed, mattress, and quilts, bedding spread on the floor, and food in abundance, according to his thoughts he manipulated [his genitals] and discharged [semen]; his sense faculties became joyful, and his complexion lustrous. The bhikṣus raised the fault and addressed the Buddha. After countless rebukes, the Buddha formulated this precept.