四分律刪繁補闕行事鈔 2.311

2.311

蹲坐者，若在床、在地上，尻不至地也。不犯者：有病、尻邊創、若有取與、若禮、若懺悔、若受教誡者。

Squatting means on a bed or on the ground, without the buttocks touching the ground. One does not commit an offense if: being ill, having sores beside the buttocks, taking or giving something, making prostrations, confessing, or receiving admonition.