釋氏要覽 1.309

1.309

（袒即肉袒）舍利弗問經云。於何時披袒（披即通覆兩肩。袒即偏露右臂）。佛言。隨供食時。應偏袒。以便作事故。作福田時。應覆兩肩現福田相故（記云。隨供養者。如見佛。禮佛。問許三師。入眾等時也。作福田者。謂計齊坐禪。誦經。入聚落。樹下坐時。使人見田相端嚴故。若對佛通披者。五百生墮鐵甲地獄）。

('Baring' means baring the flesh.) The Śāriputraparipṛcchā-sūtra states: '[Śāriputra asked:] At what times should one cover or bare [the shoulders]?' (Covering means covering both shoulders; baring means uncovering the right arm.) 'The Buddha said: "When receiving offerings of food, one should bare [the right shoulder] so as to facilitate work. When acting as a field of merit, one should cover both shoulders to display the form of a field of merit."' (A commentary notes: 'Receiving offerings refers to seeing the Buddha, paying homage to the Buddha, requesting permission from the three preceptors, entering the assembly, and the like. Acting as a field of merit refers to sitting properly in meditation, reciting sūtras, entering villages, and sitting under trees, so that people see the dignified appearance of the field pattern. If one covers both shoulders before the Buddha, one will fall into the Iron Armor Hell for five hundred lifetimes.')