梵網經菩薩戒本疏 5.61

5.61

四、具緣者，一、是正境，自有四種：一、良人，二、奴婢，三、六畜，四、盛死具。二、隨起彼想。三、正買賣。四、事成，便犯。

Fourth, possessing the conditions: 1. It is a genuine object, which naturally comprises four kinds: (1) free persons, (2) male and female slaves, (3) the six kinds of livestock, (4) vessels for corpses. 2. Correspondingly giving rise to the perception of them as such. 3. Actually buying or selling. 4. The act is completed; then an offense is incurred.