四分律刪繁補闕行事鈔 2.136

2.136

十四水界。《善見》云：蘭若處坐禪，天欲曉患睡，脫衣置岸，入池洗浴，明相出犯捨。《毘尼母》云：著衣岸上，入一脚水中者，不犯失衣。《僧祇》：水中道行界者，二十五肘；若船上者，入水即捨。

Fourteenth is the water boundary (udaka-sīmā). The Samantapāsādikā states: When sitting in meditation in an araṇya, troubled by drowsiness when dawn is about to break, one removes the robes, places them on the bank, and enters a pond to bathe; when dawn appears, one commits a forfeiture. The Vinayamātṛkā states: If one places the robes on the bank and enters the water with one foot, one does not commit the transgression of forfeiting the robes. The Mahāsāṃghika states: The water road-travel boundary is twenty-five cubits; if one is on a boat, entering the water immediately entails forfeiture.