四分律行事鈔資持記 2.1171

2.1171

四中。水本大開，且約清者；今論鹹濁，亦須受之。《僧祇》、《伽論》約色，《五分》據味。

In the fourth: water originally was a great exception, but that tentatively refers to clear water; here, discussing salty or turbid water, it must also be received. The Mahāsāṃghika-vinaya and the Saṃghabhadra-vinaya rely on color; the Mahīśāsaka-vinaya relies on taste.