梵網經菩薩戒本疏 4.69

4.69

四、具四緣：一、是肉，以非肉無犯故。二、是他肉，以食自肉無正犯故。三、起肉想，以錯誤無犯故。四、入口便犯，以不食無失故。

Fourth, having the complete four conditions: 1. it is meat, because if it is not meat there is no offense; 2. it is the meat of another, because eating one's own flesh is not a direct offense; 3. giving rise to the perception that it is meat, because if one is mistaken there is no offense; 4. an offense is committed as soon as it enters the mouth, because if one does not eat it there is no fault.